LifeWiki - User contributions [en]

Gun

2020-12-19T04:57:15Z

Flipper77: link to p28 glider gun

{{Glossary}}
[[Image:Gosperglidergun.gif|framed|right|The first known gun, the [[Gosper glider gun]]]]
A '''gun''' is a stationary pattern that repeatedly emits [[spaceship]]s (or [[rake]]s) forever. By far the most common type of guns are '''glider guns''', which emit [[glider]]s (the most well-known of which is the [[Gosper glider gun]]); however, guns that emit spaceships of other speeds, including [[c/2 orthogonal]], [[2c/5 orthogonal]], and [[c/12 diagonal]], have also been created.

==History==
The first gun to be discovered, the [[Gosper glider gun]], was found by [[Bill Gosper]] in {{year|1970}}, being the first known pattern in [[Conway's Game of Life]] to exhibit [[infinite growth]]. Since then, many guns have been constructed with various periods and that fire spaceships of various speeds. Due to simple [[glider synthesis|glider syntheses]] of the [[Types_of_spaceships#Standard_spaceship|standard spaceships]] many c/2 spaceship guns are known. The first gun that did not fire gliders or c/2 spaceships was a '''Cordergun''' (a gun that fires [[Cordership]]s) constructed by [[Jason Summers]] in July, {{year|1999}}<ref>{{cite web|url=http://entropymine.com/jason/life/status.html |title=Game of Life Status page |accessdate=October 15, 2010}}</ref> based on a synthesis of a variation of the [[7-engine Cordership]] by [[Stephen Silver]]. In March, {{year|2003}} [[Noam Elkies]] completed the synthesis of [[60P5H2V0]] which [[Dave Greene]] used to construct the [[P416_60P5H2V0_gun|first 2c/5 spaceship gun]] in April of the same year.

In July, {{year|2010}} Dave Greene constructed a few guns for a [[gemini|geminoid]] spaceship.<ref>{{Cite web|url=http://pentadecathlon.com/lifeNews/2010/07/gemini_guns_1.html|title=Gemini guns|author=Adam P. Goucher|date=July 30, 2010|accessdate=October 15, 2010}}</ref> These are the first guns that shoot obliquely-traveling spaceships and at the time were the largest patterns constructed in Life, in terms of their bounding boxes.

On February 17, {{year|2013}} [[Josh Ball]] discovered a simple [[c/7 orthogonal]] spaceship, [[loafer]]. Adam P. Goucher found a synthesis for loafer later that day, allowing the construction of c/7 orthogonal spaceship guns.<ref name="post7466" />

During March {{year|2016}} the [[copperhead]] spaceship was discovered, with a glider synthesis and several guns following suit.<ref name="post28101" />

In {{year|2019}} and {{year|2020}} guns were produced for the spaceships [[46P4H1V0]],<ref name="post84423" /> [[spider]],<ref name="post88186" /> and [[58P5H1V1]],<ref name="post97489" /> of speeds [[c/4 orthogonal]], [[c/5 orthogonal]], and [[c/5 diagonal]] respectively.

==Barrels==
The '''barrel''' of a gun (or rake) is a path along which spaceships travel. The term is most commonly used in the context of the number of barrels a gun or rake possesses, which is the number of distinct spaceship streams emitted by said gun or rake. For example, the [[AK-94]], [[B-52 bomber]] and [[Simkin glider gun]] are said to be '''double-barrelled''' because they produce two streams of gliders. The [[period-256 glider gun]] and [[Gunstar]] and its variants all have four barrels, and [[P94S]] contains 12 barrels. Given a gun with multiple barrels, one can eliminate barrels by simply placing an [[eater 1]] in the path of the unwanted glider streams.

==Pseudo-period guns==
A '''pseudo-[[period]] gun''' (as opposed to a [[true-period]]gun) is a gun that emits a period n stream of spaceships (or rakes) via a mechanism that oscillates with a period different from n -- this period will necessarily be a multiple of n. Pseudo period n glider guns are known to exist for all periods greater than or equal to 14, with smaller periods being impossible. The first pseudo period 14 gun was built by [[Dietrich Leithner]] in {{year|1995}}.

==True-period guns==
A '''true-period gun''' (as opposed to a [[#Pseudo-period guns|pseudo-period gun]]) is a gun that emits a period n stream of spaceships (or rakes) via a mechanism that oscillates with period equal to n. True period n guns are known to exist for all periods greater than 53<ref>{{Cite web|url=https://www.conwaylife.com/ref/lifepage/patterns/bhept/bhept.html|title=My Experience with B-heptominos in Oscillators|author=Dave Buckingham|accessdate=May 14, 2009|date=October 12, 1996}}</ref>, but only a few smaller periods have been achieved, namely [[Period-20 glider gun|20]], [[True period_22 gun|22]], [[True period 24 gun|24]], [[Period-28 glider gun|28]], [[Gosper glider gun|30]], [[Period-33 glider gun|33]], [[Period-36 glider gun|36]], [[Period-40 glider gun|40]], [[P44 pi-heptomino hassler|44]], [[Period-45 glider gun|45]], [[New gun 1|46]], [[True period 24 gun|48]], [[Period-50 glider gun|50]], [[Period-52 glider gun|52]]. Credits for gun periods below 62 are as follows:

<table border="0" cellpadding="0" cellspacing="0" width="100%"><tr>
{| class="wikitable"
|-
! Period
! Discoverer
! Year of discovery
|-
! [[Period-20 glider gun|20]]
| [[Matthias Merzenich]] and [[Noam Elkies]]
| {{year|2013}}
|-
! [[true_period_22_gun|22]]
| [[David Eppstein]] and [[Jason Summers]]
| {{year|2000}}
|-
! [[true_period_24_gun|24]]
| Noam Elkies
| {{year|1997}}
|-
! [[Period-28 glider gun|28]]
| Matthias Merzenich and [[Paul Callahan]]
| {{year|2020}}
|-
! [[Gosper_glider_gun|30]]
| [[Bill Gosper]]
| {{year|1970}}
|-
! [[Period-33 glider gun|33]]
| [[Arie Paap]] and Matthias Merzenich
| {{year|2018}}
|-
! [[Period-36 glider gun|36]]
| Jason Summers
| {{year|2004}}
|-
! [[Period-40 glider gun|40]]
| [[Adam P. Goucher]], Jason Summers, and Matthias Merzenich
| {{year|2013}}
|-
! [[p44_pi-heptomino_hassler|44]]
| [[David Buckingham]]
| {{year|1992}}
|-
! [[period-45_glider_gun|45]]
| Matthias Merzenich
| {{year|2010}}
|-
! [[new_gun_1|46]]
| Bill Gosper
| {{year|1971}}
|-
! [[Period-48 glider gun|48]]
| Noam Elkies
| {{year|1997}}
|-
! [[Period-50 glider gun|50]]
| [[Dean Hickerson]] and Noam Elkies
| {{year|1996}}
|-
! [[Period-52 glider gun|52]]
| [[Dave Greene]], [[Chris Cain]], Matthias Merzenich and Adam P. Goucher
| {{year|2018}}
|-
! [[Quetzal#Quetzal-54|54]]
| [[Dietrich Leithner]]
| {{year|1998}}
|-
! [[Quetzal#Quetzal-55|55]]
| [[Stephen Silver]]
| {{year|1998}}
|-
! [[Quetzal#Quetzal-56|56]]
| Dietrich Leithner
| {{year|1998}}
|-
! [[Quetzal#Quetzal-57|57]]
| Matthias Merzenich
| {{year|2016}}
|-
! [[Quetzal#Quetzal-58|58]]
| [[thunk]], Matthias Merzenich, and Chris Cain
| {{year|2016}}
|-
! [[period-59_glider_gun|59]]
| Adam P. Goucher and Jason Summers
| {{year|2009}}
|-
! [[period-60_glider_gun|60]]
| Bill Gosper
| {{year|1970}}
|-
! [[Period-61 glider gun|61]]
| [[Luka Okanishi]]
| {{year|2016}}
|}

==Guns in Life-like cellular automata==
Due to the existence of some small spaceships in [[Life-like cellular automata]] with birth at two live neighbours (B2), many low-period spaceship guns have been found using tools such as [[WinLifeSearch]]. In contrast, there are very few outer-totalistic rules without B2 (and B0) that are known to contain guns. The following is a list of outer-totalistic rules with neither B0 nor B2 that have known guns:
{| style="width:100%" |
|-
| valign="top" width="50%" |
* Glider guns<ref>{{cite web|url=http://conwaylife.com/forums/viewtopic.php?f=11&t=1071|title=Guns in Life-like cellular automata|author=[[Matthias Merzenich]] (Sokwe)|date=April 11, 2013}}</ref>
** B3/S23 ([[Conway's Game of Life]])
** B3/S236
** B3/S2367
** B3/S23678
** B3/S2368
** B3/S237
** B3/S2378
** B3/S238 ([[EightLife]])
** B36/S23 ([[HighLife]])
** B36/S237
** B36/S2378
** B36/S238
** B368/S23
** B368/S238 ([[LowDeath]])
** B37/S23 ([[DryLife]])
** B37/S236
** B37/S237
** B37/S238
** B37/S2378
** B378/S23
** B378/S237
** B378/S2378
** B378/S238
** B38/S236
** B38/S2367
** B38/S23678
** B38/S2368
** B38/S23 ([[Pedestrian Life]])
** B38/S237
** B38/S2378
** B38/S238 ([[HoneyLife]])
| valign="top" |
* Other guns
** B3/S23 ([[Conway's Game of Life]])
** B3/S237
** B3/S2378
** B3/S238 ([[EightLife]])
** B35/S236
** B358/S236
** B36/S23 ([[HighLife]])
** B36/S237
** B36/S2378
** B36/S238
** B368/S23
** B368/S238 ([[LowDeath]])
** B36/S245 ([http://www.ics.uci.edu/~eppstein/ca/replicators/b36s245.html Logarithmic replicator rule])
** B368/S245 ([[Move]])
** B368/S12578
** B3678/S34678 ([[Day & Night]])
** B37/S23 ([[DryLife]])
** B37/S238
** B378/S23
** B378/S238
** B38/S23 ([[Pedestrian Life]])
** B38/S237
** B38/S2378
** B38/S238 ([[HoneyLife]])
|}

==See also==

*[[Dieter and Peter's glider gun collection]]
*[[LifeWiki:Game_of_Life_Status_page#Glider_gun_true-periods|Glider gun true-periods status table]]
*[[LifeWiki:Game_of_Life_Status_page#Gun_pseudo-periods|Gun pseudo-periods status table]]
*[[:Category:Guns|List of guns]]
*[[Quetzal]]

==References==
<references>
<ref name="post7466">{{LinkForumThread
|format = ref
|title = Re: c/7 orthogonal spaceships
|p = 7466
|author = Shannon Omick
|date = February 18, 2013
}}</ref>
<ref name="post28101">{{LinkForumThread
|format = ref
|title = Re: is this c/10 spaceship known?
|p = 28101
|author = Alexey Nigin
|date = March 6, 2016
}}</ref>
<ref name="post84423">{{LinkForumThread
|format = ref
|title = Re: Stable signal converters
|p = 84423
|author = Goldtiger997
|date = October 22, 2019
}}</ref>
<ref name="post88186">{{LinkForumThread
|format = ref
|title = Re: Small Spaceship Syntheses
|p = 88186
|author = Entity Valkyrie
|date = January 26, 2020
}}</ref>
<ref name="post97489">{{LinkForumThread
|format = ref
|title = Re: Construction practice
|p = 97489
|author = Entity Valkyrie
|date = May 22, 2020
}}</ref>
</references>

==External links==
{{LinkWikipedia|Gun_(cellular_automaton)}}
{{LinkLexicon|lex_g.htm#gun}}
{{LinkLexicon|filename=lex_d.htm#doublebarrelled|patternname=Double-barrelled}}
{{LinkForumThread|f=2|t=1657|title=Execution of Old Guns by Variable-Speed Firing Squad}}

File:Heavyweightvolcano.png

2015-03-28T04:21:09Z

Flipper77: Flipper77 uploaded a new version of "File:Heavyweightvolcano.png"

Heavyweight volcano

2015-03-28T04:17:35Z

Flipper77: animated

{{Oscillator|p=5|name=Heavyweight volcano|pname=heavyweightvolcano|bx=17|by=24|c=104|h=33.6|discoverer=Dean Hickerson|animated=true|discoveryear=1995|nofile=true|v=0.51}}
'''Heavyweight volcano''' is a [[period]] [[:Category:Oscillators with period 5|5]] [[oscillator]] that was found by [[:Category:Patterns found by Dean Hickerson|Dean Hickerson]] in February [[:Category:Patterns found in 1995|1995]] that produces a [[Polyomino#Dominoes|domino]] [[spark]] much like a [[heavyweight spaceship]]. [[:Category:Patterns found by Scot Ellison|Scot Ellison]] reduced it to 17 columns in [[:Category:Patterns found in 2007|2007]] using [[WinLifeSearch]].

==Image gallery==
{| class="wikitable"
|-
| [[Image:HW_volcano_gen3.png|thumb|left|Original form by Dean Hickerson from 1995]] || [[Image:HW_Volcano_DE.PNG‎|thumb|left|Form by David Eppstein from October 2003]]
|-
| [[Image:HW_Volcano_KS.PNG‎|thumb|left|Form by Karel Suhajda from February 2004]] || [[Image:P435_gun.gif|framed|left|Period 435 gun shows how this pattern is used in a [[Herschel track]].]]
|}

[[Category:Oscillators with heat 33]]
[[Category:Patterns found in 2007]]
[[Category:Patterns found by Karel Suhajda]]
[[Category:Patterns found by David Eppstein]]
[[Category:Patterns found by Scot Ellison]]

==See also==
*[[Middleweight volcano]]
*[[Toaster]]

==External links==
*[http://www.argentum.freeserve.co.uk/lex_h.htm#hwvolcano Heavyweight volcano] at the Life Lexicon

File:Heavyweightvolcano.gif

2015-03-28T04:16:01Z

Flipper77: Flipper77 uploaded a new version of "File:Heavyweightvolcano.gif"

Jason's p36

2015-03-28T04:07:54Z

Flipper77: animated

{{Oscillator|name=JS p36|pname=jsp36|c=56|p=36|bx=39|by=18|h=47.2|discoverer=Jason Summers|discoveryear=2004|animated=true|nofile=true|v=0.88}}
'''JS p36''' is a [[period]] [[:Category:oscillators_with_period_36|36]] [[oscillator]] found by [[Jason Summers]] in July [[:Category:patterns_found_in_2004|2004]]. It is used in Jason's [[Period-36_Glider_Gun|p36 gun]] found at the same time. It is made of a reaction between two [[B-heptomino]]es hassled by two [[jam]]s and two [[eater 1]]s.

[[Category:Patterns with C2 symmetry]]

File:Jsp36.gif

2015-03-28T04:07:02Z

Flipper77:

File:Pufferfish.gif

2015-03-27T22:12:17Z

Flipper77: Flipper77 uploaded a new version of "File:Pufferfish.gif"

Nick Gotts

2015-03-18T09:49:34Z

Flipper77:

{{Person|name=Nick Gotts|inst=[http://www.hutton.ac.uk/ James Hutton Institute]|res=Scotland, UK}}
'''Nick Gotts''' is a [[Life enthusiast]] who is known for developing several very small (by [[cell]] count) patterns that exhibit [[infinite growth#Quadratic growth|quadratic growth]]. The previous record-holder for the smallest such pattern is his [[26-cell quadratic growth]] pattern. He also has investigated how complexity can emerge from sparse random [[soup]].

{{PatternsFoundBy|name=Nick Gotts}}

==References==
* N. M. Gotts, ''Emergent complexity in Conway's Game of Life''. In [[Game of Life Cellular Automata]] chapter 20, A. Adamatzky, Springer-UK, 389-436 (2010). ISBN: 978-1-84996-216-2.

==External links==
*[http://www.hutton.ac.uk/staff/nick-gotts Homepage] of Nick Gotts at the James Hutton Institute

{{DEFAULTSORT:Gotts, Nick}}

P61 Herschel loop 2

2015-03-17T11:25:52Z

Flipper77: uniform heat format

{{Oscillator|name=P61 Herschel loop 2|pname=p61herschelloop2|c=1596|p=61|bx=381|by=70|discoveryear=2004|nofile=true|v=0.92|h=762.3}}
'''P61 Herschel loop 2''' is a [[period]] [[:Category:oscillators with period 61|61]] [[Herschel]] [[Herschel loop|loop]] [[oscillator]]. It is the smallest oscillator of this period.
[[Category:Patterns with S2 symmetry]]

==See Also==
*[[P61 Herschel loop 1]]

Lobster

2015-03-17T11:14:10Z

Flipper77: uniform heat format

{{stub}}
{{Spaceship|name=Lobster|pname=83p7h1v1|dir=Diagonal|p=7|s=c/7|c=83|bx=26|by=26|h=81.7|discoverer=Matthias Merzenich|discoveryear=2011|animated=true|nofile=true}}
'''Lobster''' is a [[c/7 diagonal]] [[spaceship]] that was discovered by [[Matthias Merzenich]] in August [[:Category:Patterns found in 2011|2011]]. It was the first c/7 diagonal spaceship to be found.<ref>{{Cite web|url=http://pentadecathlon.com/lifeNews/2011/08/new_spaceship_velocity.html|title=New spaceship velocity|author=Adam Goucher|date=August 26, 2011|accessdate=September 12, 2011}}</ref>

== Notes ==
<references/>

Brain

2015-03-17T11:09:23Z

Flipper77: fixed heat

{{Spaceship|name=Brain|pname=brain|dir=Orthogonal|p=3|s=c/3|bx=17|by=11|c=70|h=45.3|discoverer=David Bell|discoveryear=1992|life105=true|life106=true|plaintext=true|rle=true|animated=true}}
'''Brain''' is an orthogonal [[c/3 orthogonal|c/3]] [[spaceship]] found by [[:Category:Patterns found by David Bell|David Bell]] in May [[:Category:Patterns found in 1992|1992]]. It provides a weak [[spark]] at its back which can sometimes be used to perturb objects, such as a [[glider]].

==Image gallery==
{|
|-
|[[Image:Brain_glider.png|framed|left|Brain perturbs a glider to produce a [[honey farm]] {{JavaRLE|brainperturbingglider}}]]
|}

==See also==
*[[25P3H1V0.2]]
*[[Dart]]
*[[Turtle]]
*[[Wasp]]

==External links==
*[http://www.argentum.freeserve.co.uk/lex_b.htm#brain Brain] at the Life Lexicon

P26 dependent reflector loop

2015-03-17T11:01:53Z

Flipper77: uniform heat format

{{Oscillator|type=|p=26|h=102.8|v=0.87|bx=53|by=53|name=P26 glider shuttle|pname=p26glidershuttle|c=148|discoverer=Matthias Merzenich|discoveryear=2013|life105=|life106=|plaintext=|rle=true|animated=|synthesis=|synthesisRLE=|rulemin=B3/S23|rulemax=B38/S238|rulespecial=[[Conway's Game of Life|Conway Life]]}}
'''P26 glider shuttle''' is a [[:Category:Oscillators_with_period_26|period-26]] [[oscillator]], based on a dependent period-26 [[reflector]], discovered by [[:Category:Patterns found by Matthias Merzenich|Matthias Merzenich]]<ref>{{cite web|url=http://conwaylife.com/forums/viewtopic.php?p=7842#p7842|title=Re: Just the place for a Snark!|author=Matthias Merzenich|date=April 27, 2013|accessdate=August 12, 2014}}</ref>. As of August 2014, it is the smallest period-26 oscillator in terms of [[population]], while [[pre-pulsar shuttle 26]] still keeps the record of the smallest period-26 oscillator in terms of the [[bounding box]].

== References ==
<references/>

Pulsar

2015-03-17T11:01:26Z

Flipper77: uniform heat format

{{Oscillator|name=Pulsar|pname=pulsar|p=3|bx=15|by=15|h=42.7|c=48|discoverer=John Conway|discoveryear=1970|v=0.73|animated=true|life105=true|life106=true|plaintext=true|rle=true|synthesis=3|synthesisRLE=true|rulemax=B3578/S023678|rulemin=B3/S23|rulespecial=[[Conway's Game of Life|Conway Life]]|v=0.73}}
'''Pulsar''' is, despite its size, the fourth most [[common]] [[oscillator]] (and by far the most common of [[period]] greater than 2). The three more common oscillators are [[blinker]], [[toad]], and [[beacon]].<ref>{{cite web|url=http://wwwhomes.uni-bielefeld.de/achim/freq_top_life.html |title=Most seen natural occurring ash objects in Game of Life |author=Achim Flammenkamp |date=September 7, 2004 |accessdate=January 15, 2009}}</ref> Pulsar was found very early on by [[:Category:Patterns found by John Conway|John Conway]].

The [[rotor]] of a pulsar consists of four mutually stabilizing quadrants; alternate arrangements exist for any odd multiple of 4 (for the version with 12 copies, see [[quasar]]). A closely related oscillator — the [[pulsar quadrant]] — includes just the external "horns" of the rotor and can be stabilized on its own.

==See also==
*[[List of common oscillators]]
*[[Pre-pulsar]]
*[[Pulsar quadrant]]
*[[Quasar]]

==References==
<references />

==External links==
*[http://www.argentum.freeserve.co.uk/lex_p.htm#pulsar Pulsar] at the Life Lexicon
[[Category:Patterns with D4 symmetry]]

Snacker on 38P7.2

2015-03-17T10:58:16Z

Flipper77: fixed heat

{{Oscillator|name=Snacker on 38P7.2|pname=snackeron38p7.2|c=78|p=63|bx=25|by=20|h=49.7|v=0.79|animated=true|rle=true|plaintext=true|life105=true|life106=true}}
'''Snacker on 38P7.2''' is a [[period]] [[:Category:oscillators with period 63|63]] [[oscillator]] composed of a [[snacker]] and [[38P7.2]]. Although it is composed of two oscillators of smaller periods ([[:Category:oscillators with period 9|9]] and [[:Category:Oscillators with period 7|7]] respectively), it is considered non-trivial because it has a single [[cell]] that is alive in [[generation]] 5 and dead in the other 62 [[phase]]s of the oscillator. In terms of its [[:Category:patterns with 78 cells|78]] cells, it is the smallest known non-trivial period 63 oscillator.

==Image gallery==
{|
|-
|[[Image:Snackeron38p7.2_gen5.png|framed|left|Generation 5 reveals the single cell that oscillates at the full period (in green).]]
|[[Image:alternate_snackeron38p7.2.png|framed|left|A variation of this oscillator with a slightly larger bounding box of 26×20 {{JavaRLE|alternatesnackeron38p7.2}}]]
|}

P55 pre-pulsar hassler

2015-03-17T10:56:36Z

Flipper77: uniform heat format

{{oscillator|name=Pre-pulsar hassler 55|pname=prepulsarhassler55|c=136|p=55|bx=43|by=27|h=25.8|discoverer=David Buckingham|discoveryear=1986|animated=true|life105=true|life106=true|plaintext=true|rle=true|v=0.68}}
'''Pre-pulsar hassler 55''' is a [[period]] [[:Category:oscillators with period 55|55]] [[oscillator]] discovered by [[David Buckingham]] on January 26, [[:Category:patterns found in 1986|1986]]<ref>{{CiteHickersonOscillators}}</ref>. It was the first period 55 oscillator to be found.
that works by [[hassle|hassling]] a [[pre-pulsar]] with various still-lifes. The original pattern is hassled by two [[eater 1]]s, four [[eater 3]]s, and two [[:Category:patterns with 14 cells|14]]-[[cell]] [[still life]]s, each composed of an eater 1 and a [[bun]]. A reduced set of still-lifes were discovered by [[Matthias Merzenich]] in June, [[:Category:patterns found in 2011|2011]]. The new version is hassled by four eater 1s, two eater 3s, and two [[:Category:patterns with 19 cells|19]]-cell [[Still_life#Pseudo_still_lifes|pseudo still life]]s.

==Image gallery==
{|
|-
|[[Image:prepulsarhassler55_gen4.png|framed|left|[[Generation]] 4 of the originally found pattern reveals that the object being hassled is a pre-pulsar.]]
|}

==See also==
*[[Fumarole on Achim's p11]]
*[[Pre-pulsar shuttle 26]]
*[[Pre-pulsar shuttle 28]]
*[[Pre-pulsar shuttle 29]]
*[[Pre-pulsar shuttle 47]]

==References==
<references/>
[[Category:Patterns with bilateral symmetry]]

Pentadecathlon on 37P7.1

2015-03-17T10:53:10Z

Flipper77: fixed heat

{{Oscillator|name=Pentadecathlon on 37P7.1|pname=pentadecathlonon37p7.1|c=49|p=105|bx=20|by=19|h=32.4|animated=true|rle=true|life105=true|life106=true|plaintext=true|v=0.82}}
'''Pentadecathlon on 37P7.1''' is a [[period]] [[:Category:oscillators with period 105|105]] [[oscillator]] composed of a [[pentadecathlon]] and [[37P7.1]]. Although it is composed of two oscillators of smaller periods ([[:Category:oscillators with period 15|15]] and [[:Category:oscillators with period 7|7]] respectively), it is considered non-trivial, because it contains two [[cell]]s that are alive in [[generation]] 50 and dead in the other 104 [[phase]]s of the oscillator. In terms of its [[:Category:patterns with 49 cells|49]] cells, it is the smallest known non-trivial period 105 oscillator, followed by [[Pentadecathlon on 38P7.2]] with [[:Category:patterns with 50 cells|50]] cells.

==Image gallery==
{|
|-
|[[Image:PDon37p7.1_gen50.png|framed|left|Generation 50 reveals the two cells that oscillate at the full period (in green).]]
|}

==See also==
*[[Mold on pentadecathlon]]
*[[Pentadecathlon on thumb 1]]

Mold on pentadecathlon

2015-03-17T10:47:28Z

Flipper77: fixed heat

{{Oscillator|name=Mold on pentadecathlon|pname=moldonpentadecathlon|c=24|p=60|bx=16|by=16|h=29.4|animated=true|rle=true|life105=true|life106=true|plaintext=true|synthesis=8|synthesisRLE=true|v=0.93}}
'''Mold on pentadecathlon''' is a [[period]] [[:category:oscillators with period 60|60]] [[oscillator]] composed of a [[mold]] and a [[pentadecathlon]]. Although it is composed of two oscillators of smaller periods ([[:category:oscillators with period 4|4]] and [[:category:oscillators with period 15|15]] respectively), it is considered non-trivial, because it has a single cell that is alive in [[generation]] 5 and is dead in the other 59 [[phase]]s of the oscillator. In terms of its [[:Category:patterns with 24 cells|24]] [[cell]]s it is the smallest known period 60 oscillator.

==Image gallery==
{|
|-
|[[Image:moldonPD_gen5.png|framed|left|Generation 5 reveals the single cell that oscillates at the full period (in green).]]
|}

==See also==
*[[Mold on 36P22]]
*[[Mold on 41P7.2]]
*[[P60 glider shuttle]]
*[[Pentadecathlon on 37P7.1]]
*[[Pentadecathlon on thumb 1]]

Jam

2015-03-17T10:22:29Z

Flipper77: fixed heat

{{Oscillator|p=3|c=13|name=Jam|pname=jam|h=7.3|v=0.55|bx=7|by=7|discoveryear=1988|discoverer=Achim Flammenkamp|life105=true|life106=true|plaintext=true|rle=true|animated=true|synthesis=7|synthesisRLE=true|v=0.55}}
'''Jam''' was found by [[:Category:Patterns found by Achim Flammenkamp|Achim Flammenkamp]] in [[:Category:Patterns found in 1988|1988]], but not widely known about until its independent discovery (and naming) by [[:Category:Patterns found by Dean Hickerson|Dean Hickerson]] in September [[:Category:Patterns found in 1989|1989]]. In terms of its 7×7 [[bounding box]] it ties with [[trice tongs]] as the smallest [[period]] [[:Category:Oscillators with period 3|3]] [[oscillator]], though [[caterer]] has fewer [[cell]]s. It is also about the seventeenth most [[common]] naturally-occurring oscillator, being slightly less common than the [[blocker]].<ref>{{CiteAchim|accessdate=January 15, 2009}}</ref>

==See also==
*[[Crown]]
*[[Jam on 34P13.1]]
*[[Jam on 44P7.2]]
*[[List of common oscillators]]
*[[Mold]]

==References==
<references />

==External links==
{{LinkWeisstein|filename=Jam.html}}
{{LinkLexicon|lex_j.htm#jam}}

[[Category:Asymmetric patterns]]

Caterer on Beluchenko's p13

2015-03-17T10:19:18Z

Flipper77: fixed heat

{{Oscillator|name=Caterer on 34P13|h=44.9|v=0.95|pname=catereron34p13|p=39|c=46|bx=24|by=17|discoverer=Jason Summers|discoveryear=2009|animated=yes|rle=true|life105=true|life106=true|plaintext=true}}
'''Caterer on 34P13''' is a [[period]] [[:Category:Oscillators with period 39|39]] [[oscillator]] discovered by [[Jason Summers]] in January [[:Category:patterns found in 2009|2009]]<ref>{{cite web|url=http://pentadecathlon.com/lifeNews/2009/01/new_oscillators_3.html |title=New Oscillators at Game of Life News|date=January 8, 2009 |accessdate=June 17, 2009}}</ref> that is composed of a [[caterer]] and a nearby [[34P13]]. With a minimum population of [[:Category:Patterns with 46 cells|46]] [[cell]]s, it is the smallest known period 39 oscillator, although jam on 34P13 (pictured below) has a smaller bounding box.

Even though it is made up of a period [[:Category:Oscillators with period 3|3]] oscillator and a period [[:Category:Oscillators with period 13|13]] oscillator, it is considered non-trivial because it has a single cell that oscillates at period 39 (it is alive in [[generation]] 11 but dead in the other 38 [[phase]]s).

==Image gallery==
{|
|-
|[[Image:catereron34p131_gen11.png|framed|left|Generation 11 reveals the single cell that oscillates at the full period (in green)]]
|[[Image:Jamon34p131.png|framed|left|Jam on 34P13 with a smaller bounding box of 22×17 {{JavaRLE|name=jamon34p13}}]]
|}

==See also==
*[[Caterer on 44P7.2]]

==References==
<references />

Buckaroo

2015-03-17T10:16:56Z

Flipper77: fixed heat

{{Reflector|name=Buckaroo|pname=buckaroo|a=90|h=16.7|p=30|c=23|bx=23|by=9|discoverer=David Buckingham|life105=true|life106=true|plaintext=true|rle=true|animated=yes|synthesis=6|synthesisRLE=true}}
'''Buckaroo''' is a [[queen bee shuttle]] stabilized at one end by an [[eater 1]] in such a way that it can turn a [[glider]]. It was found by [[:Category:Patterns found by David Buckingham|David Buckingham]] in the 1970s. Its name is due to [[:Category:Patterns found by Bill Gosper|Bill Gosper]].

==Image gallery==
{|
|-
|[[Image:Buckarooprereflection.png|framed|left|A buckaroo about to reflect a glider [[Media:Buckarooreflect.gif|View animated image]] ]]
|}

==See also==
* [[Hectic]]

==External links==
{{LinkLexicon|filename=lex_b.htm#buckaroo}}
{{LinkWeisstein|filename=Buckaroo.html}}

Bipole tie pseudo-barberpole

2015-03-17T10:14:04Z

Flipper77: fixed heat

{{Oscillator|name=Bipole bridge pseudo-barberpole|h=20.8|pname=bipolebridgepseudobarberpole|p=10|c=23|bx=17|by=17|animated=yes|life105=true|life106=true|plaintext=true|rle=true|synthesis=62|synthesisRLE=true|rulemin=B3/S23|rulemax=B378/S235678|rulespecial=[[Conway's Game of Life|Conway Life]]|v=0.73}}
'''Bipole bridge pseudo-barberpole''' is a [[period]] [[:Category:Oscillators with period 10|10]] [[oscillator]] that is composed of a [[bipole]] and [[pseudo-barberpole]] that are diagonally touching. It was found no earlier than [[:Category:Patterns found in 1994|1994]]. With a minimum population of [[:Category:Patterns with 23 cells|23]] [[cell]]s, it is the smallest known period 10 oscillator, though it is considered trivial because there is no individual cell that oscillates at the full period (as it is made up of a period 2 and a period 5 oscillator). The smallest known non-trivial period 10 oscillator, by minimum population, is [[24P10]].
==See also==
*[[Bridge]]

==References==
<references />

258P3 on Achim's p11

2015-03-17T10:10:41Z

Flipper77: round heat

{{Oscillator|name=258P3 on Achim's p11|pname=258p3onachimsp11|c=330|p=33|bx=49|by=31|h=199.1|discoverer=Noam Elkies|discoveryear=1997|animated=true|life105=true|life106=true|plaintext=true|rle=true|v=0.69}}
'''258P3 on Achim's p11''' is a [[period]] [[:Category:oscillators with period 33|33]] [[oscillator]] composed of [[258P3]] and [[Achim's p11]]. Although it is composed of two oscillators of smaller periods ([[:Category:oscillators with period 3|3]] and [[:Category:oscillators with period 11|11]] respectively), it is considered non-trivial because it contains a single [[cell]] that is alive in [[generation]] 21 and dead in the other 32 [[phase]]s of the oscillator. It was discovered by Noam Elkies on June 25, [[:Category:patterns found in 1997|1997]] and was the first period 33 oscillator to be found.<ref>{{CiteSummersPattern|name=all-osc}}</ref>

==Image gallery==
{|
|-
|[[Image:258p3onachimsp11_gen21.png|framed|left|Generation 21 reveals the single cell that oscillates at the full period (in green).]]
|}

==See also==
*[[92P33.1]]

==References==
<references/>

File:Honeythieves.gif

2015-03-15T19:44:36Z

Flipper77: Flipper77 uploaded a new version of "File:Honeythieves.gif"

Honey thieves

2015-03-15T12:05:45Z

Flipper77: animated

{{Oscillator|name=Honey thieves|pname=honeythieves|c=36|p=17|bx=15|by=15|h=13.9|discoverer=Matthias Merzenich|discoveryear=2014|animated=true|v=0.71|nofile=true|rulemin=B3/S23|rulemax=B38/S0238|rulespecial=[[Conway's Game of Life|Conway Life]]|rle=true|synthesis=17|synthesisRLE=true}}
'''Honey thieves''' is a [[period]] 17 [[oscillator]], consisting of a [[honey farm]] [[predecessor]], hassled by 4 [[Eater 1|eater]]s. It is the smallest known period 17 oscillator in terms of minimum [[population]], though [[54P17.1]] still has a slightly smaller [[bounding box]].

It was discovered by [[Matthias Merzenich]] in September 2014<ref>{{Cite web|url=http://www.conwaylife.com/forums/viewtopic.php?p=13179#p13179|title=Re: New p17 and other billiard tables|author=Matthias Merzenich|date=September 11, 2014|accessdate=September 11, 2014}}</ref> with a modified version of [[Dean Hickerson]]'s drifter search program, that facilitates discovery of [[Symmetry|symmetric]] oscillators.<ref>{{Cite web|url=http://www.conwaylife.com/forums/viewtopic.php?p=13159#p13159|title=A small modification of dr|author=Matthias Merzenich|date=September 10, 2014|accessdate=September 11, 2014}}</ref>

[[Mark Niemiec]] found a [[:Category:patterns that can be constructed with 17 gliders|17]]-[[glider]] [[synthesis]] of this oscillator.<ref>{{Cite web|url=http://www.conwaylife.com/forums/viewtopic.php?p=13229#p13229|title=Re: New p17 and other billiard tables|author=Mark Niemiec|date=September 13, 2014|accessdate=September 13, 2014}}</ref>

== References ==
<references/>

File:Honeythieves.gif

2015-03-15T12:05:01Z

Flipper77:

Loaflipflop

2015-03-15T12:03:06Z

Flipper77: animated

{{Oscillator|name=Loaflipflop|pname=loaflipflop|p=15|discoverer=Robert Wainwright|discoveryear=1990|bx=16|by=9|c=79|h=94.7|life105=|life106=|plaintext=|rle=true|animated=true|synthesis=|synthesisRLE=|v=1.00}}
'''Loaflipflop''' is a [[period]] [[:Category:Oscillators with period 15|15]] [[oscillator]] in which four [[pentadecathlon]]s hassle a [[loaf]]. It was found by [[Robert Wainwright]] in [[:Category:Patterns found in 1990|1990]].

File:Loaflipflop.gif

2015-03-15T12:00:13Z

Flipper77:

Pufferfish

2015-03-13T21:59:23Z

Flipper77: animated

{{Puffer|p=12|s=c/2|bx=15|by=12|dir=Orthogonal|name=Pufferfish|pname=pufferfish|c=44|discoverer=Richard Schank|discoveryear=2014|animated=true|rulemin=B3/S23|rulemax=B38/S2378|rulespecial=[[Conway's Game of Life|Conway's Life]]|rle=true|synthesis=15|synthesisRLE=true}}
'''Pufferfish''' is a [[puffer]] discovered by Richard Schank in [[:Category:Patterns found in 2014|2014]]. Being found in a symmetric [[soup]], the puffer is ''almost'' natural.<ref>{{Cite web|url=http://www.conwaylife.com/forums/viewtopic.php?p=14510#p14510|title=Re: Soup search results|author=Richard Schank|date=November 24, 2014|accessdate=November 25, 2014}}</ref> It consists of a pair of [[b-heptomino]]s whose debris is stabilised by a backend.

It is the first known [[c/2]] object that doesn't have any parts of periods 2 or 4.

On December 27, 2014 Ivan Fomichev found a non-trivial (dependent) c/2 [[fuse]] of period 36 for pufferfish's exhaust, that enabled him to assemble the first wholly high-period c/2 [[spaceship]] and [[rake]].<ref>{{cite web|url=http://www.conwaylife.com/forums/viewtopic.php?p=15269|title=Pufferfish and companions|author=Ivan Fomichev|date=December 27, 2014|accessdate=December 28, 2014}}</ref> A few days later 'glider_rider' found some smaller rakes.<ref>{{cite web|url=http://www.conwaylife.com/forums/viewtopic.php?p=15359#p15359|title=Re: Pufferfish and companions|author=glider_rider|date=December 29, 2014|accessdate=December 29, 2014}}</ref>

{|
|-
|[[Image:Pufferfishcompanion.png‎|framed|left|Pufferfish with a companion (p36 puffer) {{JavaRLE|pufferfishcompanion}}]]
|[[Image:Pufferfishspaceship.png‎|framed|left|Pufferfish-based p36 spaceship {{JavaRLE|pufferfishspaceship}}]]
|[[Image:Pufferfishrake.png‎|framed|left|Pufferfish-based p36 rake {{JavaRLE|pufferfishrake}}]]
|}

== Synthesis ==

The second pufferfish-producing soup Richard Schank found resulted in a 15-glider synthesis proposed by Chris Cain.<ref>{{cite web|url=http://www.conwaylife.com/forums/viewtopic.php?p=14595#p14595|title=Re: Soup search results|author=Chris Cain|date=November 27, 2014|accessdate=February 2, 2015}}</ref> On January 8, 2015 Ivan Fomichev made a p160 pufferfish breeder.<ref>{{cite web|url=http://www.conwaylife.com/forums/viewtopic.php?p=15857#p15857|title=Re: Pufferfish and companions|author=Ivan Fomichev|date=January 8, 2015|accessdate=February 2, 2015}}</ref>

[[Image:Pufferfishbreeder.png|thumb|left|Pufferfish breeder {{JavaRLE|pufferfishbreeder}}]] 

== References ==

<references/>

[[Category:Fuses]][[Category:Spaceships]][[Category:Rakes]]

File:Pufferfish.gif

2015-03-13T21:57:32Z

Flipper77:

Switch engine

2015-03-11T01:23:13Z

Flipper77: symmetry

__NOTOC__{{Methuselah|name=Switch engine|bx=6|by=4|pname=switchengine|c=8|l=3911|discoverer=Charles Corderman|discoveryear=1971|life105=true|life106=true|plaintext=true|rle=true}}
A '''switch engine''' (or '''Corder engine'''<ref>{{cite web|url=http://www.argentum.freeserve.co.uk/lex_c.htm#corderengine |title=Corder engine |work=The Life Lexicon |publisher=Stephen Silver |accessdate=June 10, 2009}}</ref>) is a [[methuselah]] that was found by [[Charles Corderman]] in [[:Category:Patterns found in 1971|1971]]. It produces a copy of itself after 48 generation, glide-reflected 4 cells northwest (in the case of the starting configuration shown to the right), along with some active junk. If left unattended, the accumulating exhaust overtakes and destroys the engine after 24 cycles, but it can be stabilized to make [[:Category:Spaceships with speed c/12|c/12]] diagonal [[puffer]]s and [[spaceship]]s.

There are two basic types of stabilized switch engine, both of which were also found by Charles Corderman: the [[period]] 288 [[block-laying switch engine]] (the more common of the two) and period 384 [[glider-producing switch engine]]. These two puffers are the most natural [[infinite growth]] patterns in [[Conway's Game of Life|Life]], being the only ones ever seen to occur from non-symmetric [[soup|random starting patterns]].

Because the switch engine lends itself so naturally to infinitely-growing patterns, it appears in many of the smallest known superlinear growth patterns, including the [[mosquito]]es, [[catacryst]], [[metacatacryst]], [[Gotts dots]], and [[26-cell quadratic growth]].

In addition to the puffers based on a single switch engine, puffers such as [[Noah's ark]] can be created by combining two switch engines. Such puffers are generally quite [[dirty]]. By combining even more switch engines, it is possible to create [[Cordership]]s, which move at [[:Category:Spaceships with speed c/12|c/12]] diagonally and are thus the slowest known spaceships in Life other than [[Gemini|Geminoids]]. Such spaceships can be constructed by combining as few as [[3-engine Cordership|three]] switch engines.

=='Swimmer' tracks==
Like [[Herschel|Herschels]], switch engines can be supported by [[conduit|conduits]] made out of well-separated still lifes.<ref>{{cite web|url=http://pentadecathlon.com/lifenews/2005/09/bobsled_run_update.html|title=Bobsled run update|author=Dave Greene|publisher=Game of Life News|accessdate=September 21, 2014}}</ref> These 'swimmer tracks' were discovered by [[David Bell]] in 2005, and can be any length. Stable converters have been constructed that convert Herschels to switch engines and back<ref>{{cite web|url=http://b3s23life.blogspot.com/2007/06/new-kind-of-signal-though-not-useful.html|title=A New Kind of Signal|author=Dave Greene|publisher=Work in Progress blog|accessdate=September 21, 2014}}</ref>. The Herschel-to-swimmer converter could now be made much faster, smaller and more efficient with new technology, particularly [[Snark|Snark reflectors]].

==Stable pattern==
The stable pattern that results from the switch engine has 842 [[cell]]s. It consists of 60 [[block]]s, 33 [[beehive]]s (including one [[honey farm]]), 50 [[blinker]]s (including eight [[traffic light]]s), 12 [[glider]]s, 11 [[boat]]s, 11 [[loaf|loaves]], four [[ship]]s, two [[long boat]]s, two [[pond]]s, and two [[tub]]s.
{|
|-
|[[Image:Switchengine_final.png|thumb|left|Generation 3911]]
|}

==See also==
*[[Ark]]
*[[Cordership]]
*[[Infinite growth]]
*[[Time bomb]]

==References==
<references />

==External links==
{{LinkWeisstein|SwitchEngine.html}}
{{LinkLexicon|lex_s.htm#switchengine}}
*[http://www.calcyman.co.uk/life/corder.htm Corderships and Switch Engines] at [http://www.calcyman.co.uk/ www.calcyman.co.uk]

[[Category:Puffer engines]]

Lidka

2015-03-10T18:59:15Z

Flipper77: references tag

__NOTOC__{{Methuselah|l=29055|bx=9|by=15|name=Lidka|pname=lidka|c=13|discoverer=Andrzej Okrasinski|discoveryear=2005|life105=true|life106=true|plaintext=true|rle=true}}
'''Lidka''' is a [[methuselah]] that was originally found in the 15-cell form shown below by [[:Category:Patterns found by Andrzej Okrasinski|Andrzej Okrasinski]], which has a lifespan of 29053 [[generation]]s. The 13-cell [[grandparent]] with lifespan 29055 shown to the right was soon after found by [[:Category:Patterns found by David Bell|David Bell]].

Incidentally, the 9-cell pattern in the lower right corner of this pattern, fitting in a 5x5 bounding box, is also a methuselah in its own right: it stabilizes after 595 generations to a constellation of 182 cells.

==Stable pattern==
The stable pattern that results from Lidka has 1623 [[cell]]s and consists of 135 [[blinker]]s (including seven [[traffic light]]s, three [[Interchange]]s), 102 [[block]]s, 57 [[beehive]]s (including two [[honey farm]]s), 28 [[glider]]s, 18 [[loaf|loaves]], 15 [[boat]]s, six [[ship]]s, five [[pond]]s, two [[tub]]s, two [[ship-tie]]s in the form of a [[fleet]], one [[toad]], one [[beacon]], and one [[long boat]].<ref>{{cite web|url=http://gameoflife-news.blogspot.com/2005/07/new-record-methuselah.html |title=New Record Methuselah |author=Koenig, H. |date=July 14, 2005 |accessdate=February 9, 2009}}</ref>

==Image gallery==
<gallery>
Image:29055M_gen2.png|Generation 2 of Lidka is the form in which it was originally found
Image:29055M_final.png|Generation 29055
</gallery>

==See also==
*[[List of long-lived methuselahs]]

==References==
<references/>

==External links==
{{LinkLexicon|lex_l.htm#lidka}}
*[http://gameoflife-news.blogspot.com/2005/07/new-record-methuselah.html New Record Methuselah] at Game of Life News
*[http://www.geocities.com/conwaylife/ Andrzej Okrasinski's Game of Life page describing the discovery]
[[Category:Patterns found by David Bell]]

File:Honeybit.png

2015-03-09T23:37:54Z

Flipper77:

Scot's p5

2015-03-09T22:09:27Z

Flipper77: changed v (rounding)

{{Oscillator|image=true|animated=true|name=Scot's p5|pname=scotsp5|discoverer=Scot Ellison|p=5|c=28|bx=13|by=8|h=32.8|v=0.94|discoveryear=2008|rle=true|plaintext=true|life105=true|life106=true}}
'''Scot's p5''' is a [[period]] [[:Category:Oscillators with period 5|5]] [[oscillator]] that was found by [[Scot Ellison]] in June [[:Category:Patterns found in 2008|2008]]. It has the second highest [[volatility]] of any known period 5 oscillator.

==See also==
*[[Period_5_oscillators#Smallest|Smallest period five oscillators]]
*[[Period_5_oscillators#highest_volatility|Largest volatility period five oscillators]]
*[[Swine]]
[[Category:Patterns with bilateral symmetry]]

P55 pre-pulsar hassler

2015-03-09T22:08:37Z

Flipper77: changed v

{{oscillator|name=Pre-pulsar hassler 55|pname=prepulsarhassler55|c=136|p=55|bx=43|by=27|h=25.82|discoverer=David Buckingham|discoveryear=1986|animated=true|life105=true|life106=true|plaintext=true|rle=true|v=0.68}}
'''Pre-pulsar hassler 55''' is a [[period]] [[:Category:oscillators with period 55|55]] [[oscillator]] discovered by [[David Buckingham]] on January 26, [[:Category:patterns found in 1986|1986]]<ref>{{CiteHickersonOscillators}}</ref>. It was the first period 55 oscillator to be found.
that works by [[hassle|hassling]] a [[pre-pulsar]] with various still-lifes. The original pattern is hassled by two [[eater 1]]s, four [[eater 3]]s, and two [[:Category:patterns with 14 cells|14]]-[[cell]] [[still life]]s, each composed of an eater 1 and a [[bun]]. A reduced set of still-lifes were discovered by [[Matthias Merzenich]] in June, [[:Category:patterns found in 2011|2011]]. The new version is hassled by four eater 1s, two eater 3s, and two [[:Category:patterns with 19 cells|19]]-cell [[Still_life#Pseudo_still_lifes|pseudo still life]]s.

==Image gallery==
{|
|-
|[[Image:prepulsarhassler55_gen4.png|framed|left|[[Generation]] 4 of the originally found pattern reveals that the object being hassled is a pre-pulsar.]]
|}

==See also==
*[[Fumarole on Achim's p11]]
*[[Pre-pulsar shuttle 26]]
*[[Pre-pulsar shuttle 28]]
*[[Pre-pulsar shuttle 29]]
*[[Pre-pulsar shuttle 47]]

==References==
<references/>
[[Category:Patterns with bilateral symmetry]]

Pentoad

2015-03-09T22:07:42Z

Flipper77: changed v (rounding)

__NOTOC__{{Oscillator|p=5|name=Pentoad|pname=pentoad|c=20|h=8.8|bx=13|by=12|v=0.65|life105=true|life106=true|plaintext=true|rle=true|discoverer=Bill Gosper|discoveryear=1977|animated=true|synthesis=12|synthesisRLE=true}}
'''Pentoad''' (or '''eater-bound Z-hexomino'''<ref>{{cite web|url=http://home.interserv.com/~mniemiec/20et2z.rle|title=Eater-bound Z-hexomino glider synthesis RLE file|author=Mark D. Niemiec|accessdate=April 28, 2009}}</ref>) is a [[period]] [[:Category:Oscillators with period 5|5]] [[oscillator]] that was found by [[:Category:Patterns found by Bill Gosper|Bill Gosper]] in June [[:Category:Patterns found in 1977|1977]]. It consists of a [[Z-hexomino]] that is stabilized by two [[eater 1]]s.

It was discovered by Scott Kim that this oscillator is extensible by moving one of the eaters diagonally away by four [[cell]]s and inserting another Z-hexomino in the gap. A pentoad constructed in this way with n Z-hexominoes has 14 + 6n cells and [[heat]] 8.8 + 6.4n. The pentoad with two Z-hexominoes is shown below.

==Image gallery==
{|
|-
|[[Image:Pentoad2.png|framed|left|The pentoad with two Z-hexominoes. {{JavaRLE|pentoadwithtwohexominoes}}]]
|}

==See also==
*[[Biting off more than they can chew]]
*[[Toad]]
*[[Period_5_oscillators#Smallest|Smallest period five oscillators]]

==References==
<references />

==External links==
{{LinkWeisstein|filename=Pentoad.html}}
{{LinkLexicon|filename=lex_p.htm#pentoad}}
[[Category:Patterns with S2 symmetry]]

Pentant

2015-03-09T22:06:58Z

Flipper77: changed v (rounding)

{{Oscillator|name=Pentant|pname=pentant|p=5|c=28|h=4|bx=10|by=12|v=0.29|discoverer=David Buckingham|discoveryear=1976|life105=true|life106=true|plaintext=true|rle=true|animated=true}}
'''Pentant''' is a [[period#Oscillators|period]] [[:Category:Oscillators with period 5|5]] [[oscillator]] that was found by [[:Category:Patterns found by David Buckingham|David Buckingham]] in July [[:Category:Patterns found in 1976|1976]].

==See also==
*[[Period_5_oscillators#Smallest|Smallest period five oscillators]]

==External links==
*[http://www.argentum.freeserve.co.uk/lex_p.htm#pentant Pentant] at the Life Lexicon

P56 B-heptomino shuttle

2015-03-09T22:06:14Z

Flipper77: changed v

{{Oscillator|name=P56 B-heptomino shuttle|pname=p56bheptominoshuttle|c=45|p=56|bx=28|by=21|h=30.3|discoverer=David Buckingham|animated=true|rle=true|life105=true|life106=true|plaintext=true|synthesis=19|synthesisRLE=true|v=0.94}}
'''P56 B-heptomino shuttle''' is a [[period]] [[:Category:Oscillators with period 56|56]] [[oscillator]] discovered in its original form (shown below) by [[David Buckingham]] sometime before May [[:Category:patterns found in 1991|1991]],<ref>{{CiteHickersonOscillators}}</ref> being the first period 56 oscillator to be found. It consists of a [[B-heptomino]] being [[hassle]]d by two [[blocker]]s and two [[block]]s. In terms of its [[:Category:Patterns with 45 cells|45]] [[cell]]s, it is the smallest known period 56 oscillator.<ref>Jason Summers' ''all-osc'' oscillators collection</ref>

==Image gallery==
{|
|-
|[[Image:45P56_gen8.png|framed|left|[[Generation]] 8 reveals that the object being hassled is a B-heptomino.]]
|[[Image:45P56_original.png|framed|left|The original form of this oscillator using [[Kok's galaxy|Kok's galaxies]] instead of blockers {{JavaRLE|Originalp56bheptominoshuttle|brief}}]]
|}

==See also==
*[[P40 B-heptomino shuttle]]

==References==
<references/>

[[Category:Shuttles]]

Harbor

2015-03-09T21:44:37Z

Flipper77: changed v

{{Oscillator|p=5|name=Harbor|pname=harbor|bx=17|by=17|animated=true|c=64|h=35.2|discoverer=David Buckingham|discoveryear=1978|life105=true|life106=true|plaintext=true|rle=true|synthesis=34|synthesisRLE=true|v=0.64}}
'''Harbor''' is a [[period]] [[:Category:Oscillators with period 5|5]] [[oscillator]] that was found by [[:Category:Patterns found by David Buckingham|David Buckingham]] in September [[:Category:Patterns found in 1978|1978]]. It was named by [[:Category:Patterns found by Dean Hickerson|Dean Hickerson]]. In one [[phase]], it consists of four [[ship]]s and eight [[boat]]s.

==See also==
*[[Fleet]]

==External links==
{{LinkLexicon|lex_h.htm#harbor}}
[[Category:Patterns with D4 symmetry]]

Blocked p4-2

2015-03-09T21:43:59Z

Flipper77: changed v (inverted)

{{Oscillator|name=Blocked p4-2|pname=blockedp42|c=48|p=4|bx=22|by=8|discoverer=Adam P. Goucher|discoveryear=2010|rle=true|life105=true|life106=true|plaintext=true|h=24|v=0.55|animated=true}}
'''Blocked p4-2''' is a [[period]] [[:Category:oscillators with period 4|4]] [[oscillator]] discovered by [[Adam P. Goucher]] in April, [[:Category:patterns found in 2010|2010]]. The oscillator was inspired by [[Ellison_P4_HW_Emulator|Ellison p4 HW emulator]] and [[Ellison_P4_HW_Emulator_Hybrid|Ellison p4 HW emulator hybrid]].

==See also==
*[[Block]]
*[[Blocked_p4_t-nose_ hybrid|Blocked p4 t-nose hybrid]]
*[[Blocked_p4_t-nose|Blocked p4 t-nose]]
*[[Blocked_p4-1|Blocked p4-1]]
*[[Blocked_p4-3|Blocked p4-3]]
*[[Blocked_p4-4|Blocked p4-4]]
*[[Blocked_p4-5|Blocked p4-5]]

[[Category:Patterns with bilateral symmetry]]

258P3

2015-03-09T15:15:33Z

Flipper77: references tag

{{Oscillator|name=258P3|pname=258p3|c=258|p=3|bx=28|by=27|h=130.7|discoverer=Noam Elkies|discoveryear=1997|animated=true|life105=true|life106=true|plaintext=true|rle=true|v=0.54}}
'''258P3''' is a [[period]] [[:Category:oscillators with period 3|3]] [[oscillator]] discovered by [[Noam Elkies]] on June 25, [[:Category:patterns found in 1997|1997]].<ref>{{CiteSummersPattern|name=all-osc}}</ref> In [[generation]] 2 it provides an isolated [[domino]] [[spark]] which can be used in the creation of higher period oscillators, such as the first known period [[:Category:oscillators with period 33|33]] oscillator, [[258P3 on Achim's p11]]. A related but slightly smaller oscillator was found by [[Karel Suhajda]] on January 13, [[:Category:patterns found in 2003|2003]].<ref>{{CiteSummersPattern|name=all-osc}}</ref>

==Image gallery==
{|
|-
|[[Image:258p3_gen2.png|framed|left|Generation 3 reveals the isolated domino spark.]]
|[[Image:246p3.png|framed|left|A related domino sparker discovered by Karel Suhajda {{JavaRLE|246p3}}]]
|}

==References==
<references/>

[[Category:Patterns with bilateral symmetry]]

101

2015-03-09T14:58:37Z

Flipper77: changed v

{{Oscillator|name=101|pname=101|p=5|c=64|bx=18|by=12|h=17.6|v=0.46|animated=yes|discoverer=Achim Flammenkamp||discoveryear=1994|life105=true|life106=true|plaintext=true|rle=true|rulemin=B3/S23|rulemax=B378/S023678|rulespecial=Dotlife, [[Conway's Game of Life|Conway's Life]], DryLife}}
'''101''' was found by [[:Category:Patterns found by Achim Flammenkamp|Achim Flammenkamp]] in August [[:Category:Patterns found in 1994|1994]]. The name was suggested by [[:Category:Patterns found by Bill Gosper|Bill Gosper]], noting that the [[phase]] shown to the right displays the [[period]] in binary.

==External links==
{{LinkWeisstein|101.html}}
{{LinkLexicon|lex_1.htm#a101}}
[[Category:Patterns with D2 symmetry]]

Short keys

2015-03-06T08:52:03Z

Flipper77: changed v (inverted)

{{Oscillator|p=3|name=Short keys|pname=shortkeys|discoverer=Dean Hickerson|discoveryear=1989|c=16|bx=12|by=5|h=14.7|v=0.73|life105=true|life106=true|plaintext=true|rle=true|animated=true|synthesis=10|synthesisRLE=true}}
'''Short keys''' is a [[period]] [[:Category:Oscillators with period 3|3]] [[oscillator]] found by [[:Category:Patterns found by Dean Hickerson|Dean Hickerson]] in August [[:Category:Patterns found in 1989|1989]]. In August [[:Category:patterns found in 2004|2004]] [[Jason Summers]] found a [[:Category:patterns that can be constructed with 10 gliders|10]]-[[glider]] [[glider synthesis|synthesis]] of this oscillator.<ref>{{CiteSummersPattern|name=jslife}}</ref>

==See also==
*[[Bent keys]]
*[[Odd keys]]

==References==
<references/>

==External links==
{{LinkLexicon|lex_s.htm#shortkeys}}

Quad

2015-03-06T08:48:15Z

Flipper77: changed v

{{Oscillator|p=2|c=16|bx=6|by=6|h=8|v=0.40|name=Quad|pname=quad|discoverer=Robert Kraus|discoveryear=1971|life105=true|life106=true|plaintext=true|rle=true|animated=true|synthesis=16|synthesisRLE=true}}
'''Quad''' (or '''barberpole intersection'''<ref>{{cite web|url=http://www.ericweisstein.com/encyclopedias/life/Quad.html|title=Quad|publisher=Eric Weisstein's Treasure Trove of Life|author=Eric Weisstein|accessdate=May 1, 2009}}</ref>) is a [[period]] [[:Category:Oscillators with period 2|2]] [[oscillator]] and [[muttering moat]] that was found in April [[:Category:Patterns found in 1971|1971]] by [[:Category:Patterns found by Robert Kraus|Robert Kraus]]. It has the same rotor as the [[clock]]. It is the only [[flipper]] that fits inside a 6 × 6 [[bounding box]].

==See also==
*[[Skewed quad]]

==References==
<references />

==External links==
{{LinkLexicon|lex_q.htm#quad}}

Newshuttle

2015-03-06T08:45:43Z

Flipper77: changed v (rounding)

{{Oscillator|name=Newshuttle|pname=newshuttle|p=28|c=288|bx=49|by=49|h=137.1|v=0.82|discoverer=David Buckingham|discoveryear=1973|animated=true|rle=true|life105=true|life106=true|plaintext=true}}
'''Newshuttle''' is a [[period]] [[:Category:oscillators with period 28|28]] [[pre-pulsar]] [[shuttle]] [[oscillator]] discovered by [[David Buckingham]] in [[:Category:patterns found in 1973|1973]],<ref>{{CiteHickersonOscillators}}</ref><ref>{{cite web|url=http://www.conwaylife.com/wiki/index.php?title=Lifeline_Volume_11|title=Lifeline Number 11|publisher=Robert Wainwright|date=September 1973}}</ref> being the first oscillator of that period to be found. It was also the fourth shuttle oscillator to be found, after the [[queen bee shuttle]], the [[twin bees shuttle]], and a variation of [[eureka]] stabilized by [[pentadecathlon]]s and [[queen bee]]s. This was the only known period 28 oscillator until the discovery of '''smaller newshuttle''' in [[:Category:patterns found in 1980|1980]].

==Image gallery==
{|
|-
|[[Image:smallernewshuttle.png|framed|left|Smaller newshuttle {{JavaRLE|smallernewshuttle}}]]
|}

==See also==
*[[Pre-pulsar shuttle 26]]
*[[Pre-pulsar shuttle 28]]
*[[Pre-pulsar shuttle 29]]
*[[Pre-pulsar shuttle 47]]

==References==
<references/>

[[Category:Shuttles]]

Confused eaters

2015-03-06T08:41:18Z

Flipper77: changed v (rounding)

{{Oscillator|p=4|name=Confused eaters|pname=confusedeaters|c=20|bx=11|by=11|h=6|v=0.43|discoverer=David Buckingham|life105=true|life106=true|plaintext=true|rle=true|animated=true|synthesis=20|synthesisRLE=true}}
'''Confused eaters''' is a [[period]] [[:Category:Oscillators with period 4|4]] [[oscillator]] that was found by [[:Category:Patterns found by David Buckingham|David Buckingham]] no later than [[:Category:Patterns found in 1972|1972]].
It consists of two [[eater 1]]s hassling a nine.

==See also==
*[[Eater plug]]

==External links==
{{LinkWeisstein|filename=ConfusedEaters.html}}
{{LinkLexicon|filename=lex_c.htm#confusedeaters}}

Caterer on figure eight

2015-03-06T08:40:14Z

Flipper77: changed v (rounding)

{{Oscillator|name=Caterer on figure eight|pname=catereronfigureeight|c=24|p=24|bx=20|by=10|h=31.3|v=0.96|animated=yes|life105=true|life106=true|plaintext=true|rle=true}}
'''Caterer on figure eight''' is a [[period]] [[:Category:Oscillators with period 24|24]] [[oscillator]] composed of a [[caterer]] and a [[figure eight]]. In terms of its 24 [[cell]]s, it is the smallest known period 24 oscillator.<ref>{{CiteSummersPattern|name=all-osc|accessdate=April 17, 2009}}</ref>

Despite being composed of two oscillators of smaller period ([[:Category:Oscillators with period 3|3]] and [[:Category:Oscillators with period 8|8]] respectively), it is considered non-trivial because it has a single cell that is alive in [[generation]] 23 and is dead in its other 23 [[phase]]s.

==Image gallery==
{|
|-
|[[Image:catereronfigureeight_gen23.png|framed|left|Generation 23 reveals the single cell with period 24 (in green)]]
|}

==References==
<references />

Caterer on 44P7.2

2015-03-06T08:39:25Z

Flipper77: changed v (rounding)

{{Oscillator|name=Caterer on 44P7.2|pname=catereron44p7.2|c=56|p=21|bx=19|by=16|h=20.5|v=0.49|animated=yes|rle=true|life106=true|life105=true|plaintext=true}}
'''Caterer on 44P7.2''' is a [[period]]-[[:Category:Oscillators with period 21|21]] [[oscillator]] composed of a [[caterer]] and the unnamed [[44P7.2]]. In terms of its [[:Category:patterns_with_56_cells|56]] [[cell]]s, it is the smallest known non-trivial period 21 oscillator, although jam on 44P7.2 (pictured below) has a smaller bounding box.

Despite being composed of two oscillators of smaller periods ([[:Category:Oscillators with period 3|3]] and [[:Category:Oscillators with period 7|7]] respectively), it is considered non-trivial because it has a single cell that is alive in [[generation]] 14 and is dead in its other 20 [[phase]]s.

==Image gallery==
{|
|-
|[[Image:catereron44p7.2_gen14.png|framed|left|Generation 14 reveals the single cell with period 21 (in green)]]
|[[Image:jamon44p7.2.png|framed|left|Jam on 44P7.2 with a smaller bounding box of 17×16 {{JavaRLE|jamon44p7.2|breif}}]]
|}

==See also==
*[[Caterer on 34P13]]

Caterer on Jason's p22

2015-03-06T08:38:43Z

Flipper77: changed v (rounding)

{{Oscillator|name=Caterer on 36P22|pname=catereron36p22|c=48|p=66|bx=33|by=15|h=50.3|v=0.93|animated=true|rle=true|life105=true|life106=true|plaintext=true}}
'''Caterer on 36P22''' is a [[period]] [[:Category:oscillators with period 66|66]] [[oscillator]] composed of a [[caterer]] and [[36P22]]. Although it consists of two oscillators of smaller periods ([[:category:oscillators with period 3|3]] and [[:Category:oscillators with period 22|22]] respectively), it is considered non-trivial, because it contains a single [[cell]] that oscillates at the full period. In terms of its [[:Category:patterns with 48 cells|48]] cells, it is the smallest known period 66 oscillator.

==Image gallery==
{|
|-
|[[Image:catereron36p22_gen14.png|framed|left|[[Generation]] 14 reveals the single cell that oscillates at the full period (in green).]]
|}

==See also==
*[[Mold on 36P22]]
*[[Pseudo-barberpole on 36P22]]

Cord puller

2015-02-26T10:35:24Z

Flipper77:

{{Pattern|type=Sawtooth|name=Cord puller|discoverer=Dean Hickerson|discoveryear=1991|pname=cordpuller|c=434|bx=98|by=93|life105=true|life106=true|plaintext=true|rle=true}}
'''Cord puller''' is a diagonal [[sawtooth]] that was discovered by [[Dean Hickerson]] on May 14, [[:Category:Patterns found in 1991|1991]]. It has expansion factor 6.

It works by firing pairs of [[glider]]s at the back of a [[7-engine Cordership]] so that when the first pair hits the Cordership, a [[block]] is created in the path of the following glider pairs. When those pairs hit the block, it is pulled back closer to the [[gun]] at the southeast. When the block reaches the gun, it is destroyed, allowing the gliders to reach the Cordership again and start the process over again.

Its population in generation t = 8(6n) - 216 (n ≥ 2) is t/36 + 558, but the population in generation 32(6n) - 429 (n ≥ 2) is only 469.<ref>[[Alan Hensel]]'s [http://www.ibiblio.org/lifepatterns/ lifep.zip pattern collection].</ref>

==Image gallery==
{|
|-
|[[Image:Cordpuller_pop.png|thumb|left|The number of alive cells plotted versus the number of elapsed [[generation]]s roughly forms an ever-increasing sawtooth graph.]]
|}

==References==
<references />

User talk:Yimmy

2015-02-18T01:48:56Z

Flipper77: Created page with "If you want a quick and easy way to get rules for patterns, go [http://www.conwaylife.com/forums/viewtopic.php?f=9&t=45&start=0#p507 here] for the script (You'll need Golly to..."

If you want a quick and easy way to get rules for patterns, go [http://www.conwaylife.com/forums/viewtopic.php?f=9&t=45&start=0#p507 here] for the script (You'll need Golly to use it, which I assume you have already. If not, go [http://golly.sourceforge.net/ here] first to get it.)
[[User:Flipper77|flipper77]] ([[User talk:Flipper77|talk]]) 01:48, 18 February 2015 (UTC)