LifeWiki - User contributions [en]

Half-baked knightship

2014-07-20T18:52:25Z

Alex79:

{{Spaceship|name=Half-baked knightship|pname=hbk|p=2621440|s=3c/1310720|dir=slope 2|c=1049396|bx=450801|by=461227|discoverer=Adam P. Goucher|discoveryear=2014|nofile=true|rulespecial=[[Conway's Game of Life|Conway Life]]|rulemin=B3/S23|rulemax=B3/S23}}
'''Half-baked knightship''' is a class of [[knightship]]s based on the well-known [[Bi-loaf_1|half-bakery]] reaction with a [[glider]]. Representatives of this class are currently the smallest known [[oblique spaceship]]s in [[Conway's Game of Life]] both in terms of the [[bounding box]] and minimum [[population]], leaving [[Gemini]] and its derivatives, the only formerly known oblique spaceships, out of reach. A half-baked knightship with the minimum population of as few as 132,946 cells, the period of 245,912 generations and the bounding box of 31,080×32,771 cells is known.<ref name="smallest">{{cite web|url=http://www.conwaylife.com/forums/viewtopic.php?p=12681#p12681|title=Re: Half-bakery reaction with glider|author=Chris Cain|date=July 17, 2014|accessdate=July 18, 2014}}</ref>

Components and [[slow salvo]] syntheses for the ship were found by the combined efforts of Chris Cain, Ivan Fomichev and Dave Greene. Adam P. Goucher proposed the base design for the ship <ref>{{cite web|url=http://conwaylife.com/forums/viewtopic.php?p=12164#p12164|title=Re: Half-bakery reaction with glider|author=Dave Greene|date=June 7, 2014|accessdate=July 14, 2014}}</ref> and wrote a [[Golly]] script that can put the components together into a working knightship of any sufficiently large [[period]]. Several days later, Chris Cain wrote an alternative assembly script that took advantage of superior components, that had already been known, and built a half-baked knightship an order of magnitude smaller.<ref name="smallest"/>

In May 2014 Ivan Fomichev found the key reactions, which allow long chains of half-bakeries to regenerate themselves at (6, 3), and also to regenerate seed constellations at one end of the ship. When triggered, the seeds produce the small glider salvos that mediate the (6, 3) offset reaction.

Like [[Gemini]], a reconstructor, this knightship moves very slowly, but unlike any reconstructor, only a tiny fraction of the half-baked knightship has an embedded construction recipe. The half-bakery chains encode a small slow salvo recipe, but the positions of the half-bakeries are not encoded anywhere else.

==References==
<references/>

== See also ==
* [[Caterpillar]]
* [[Gemini]]

[[Category:Patterns found by Chris Cain]]
[[Category:Patterns found by Dave Greene]]
[[Category:Patterns found by Ivan Fomichev]]

Roteightor

2014-02-18T23:28:44Z

Alex79:

__NOTOC__{{Oscillator|name=Roteightor|pname=roteightor|c=35|p=8|bx=14|by=14|h=11.0|v=0.63|discoverer=Robert Wainwright|discoveryear=1972|animated=yes|life105=true|life106=true|plaintext=true|rle=true}}
'''Roteightor''' is a [[period]] [[:Category:Oscillators with period 8|8]] [[oscillator]] with 35 [[cell]]s. It was discovered by [[Robert Wainwright]] in [[:Category:Patterns found in 1972|1972]]. It consists of four [[eater 1]]s [[hassle|hassling]] a [[fleet]] predecessor that resembles a standard spaceship of length 3, sometimes called an underweight spaceship. It can also be extended as an [[agar]].

==Etymology==
The roteightor is period eight, and in an extended roteightor with the underweight spaceships in their dense phases the UWSSs that touch resemble black eights.

==Image gallery==
{|
|-
|[[Image:roteightor_extension.png|framed|left|An extension of roteightor<br/>{{JavaRLE|roteightorextension|brief}}]]
|}

==See also==
*[[35P52]]
*[[Dinner table]]

==External links==
{{LinkWeisstein|Roteightor.html}}
{{LinkLexicon|lex_r.htm#roteightor}}

Underweight spaceship

2014-02-18T23:14:25Z

Alex79: Redirected page to Roteightor

#Redirect [[roteightor]]

Types of spaceships

2014-02-18T23:11:37Z

Alex79:

{{Glossary}}
There are many different '''types of [[spaceships]]''' in [[Conway's Game of Life]] and related [[cellular automaton|automata]]. The following are the terminology that are in common use. This page contains only very general terminology that applies to wide varieties of spaceships.

==Edge-repair spaceship==
An '''edge-repair spaceship''' is a spaceship that has an edge that possesses no [[spark]] and yet is able to perturb things because of its ability to repair certain types of damage to itself. The most useful example is [[edge-repair spaceship 1]], which can destroy [[Herschel]]s as it travels. Another well-known example is [[edge-repair spaceship 2]], which can destroy [[beehive]]s.

==Flipper==
A '''flipper''' is a spaceship (or [[oscillator]]) that forms its mirror image halfway through its [[period]]. All flipper spaceships are [[#Glide symmetric spaceship|glide symmetric]] and conversely all glide symmetric spaceships are flippers. The most common examples are the [[glider]], [[lightweight spaceship]], [[middleweight spaceship]], and [[heavyweight spaceship]].

==Flotilla==
A [[Spaceship flotilla|'''flotilla''']] is a spaceship composed of a number of smaller interacting spaceships. Often one or more of these is not a true spaceship and could not survive without the support of the others. [[Flotilla 1]] is the most common example, and it contains an [[overweight spaceship]] escorted by two [[heavyweight spaceship]]s.

==Frothing spaceship==
A '''frothing spaceship''' is a spaceship whose back end appears to be unstable and breaking apart, but which nonetheless survives (compare with [[frothing puffer]]). The exhaust festers and clings to the back of the spaceship before breaking off.

==Glide symmetric spaceship==
A spaceship is said to be '''glide symmetric''' if it undergoes [[reflection]] and [[translation]] simultaneously. It is not difficult to show that a spaceship is glide symmetric if and only if it is a [[#Flipper|flipper]].

==Knightship==
[[Image:AlmostKnightship.png|framed|right|An "almost knightship"<br />{{JavaRLE|almostknightship}}]]A '''knightship''' is a spaceship of type (2m,m)/n (that is, a spaceship that moves two [[cell]]s horizontally for every one cell it moves vertically). Knightships must be asymmetric and their period must be at least 6, which makes searching for them using programs like [[lifesrc]] very difficult. An "almost knightship" was found by [[Eugene Langvagen]] on March 23, [[:Category:Patterns found in 2004|2004]], which would be a period-6 knightship if it weren't for two cells that are incorrect in its sixth generation.<ref>{{cite web|url=http://plife.sourceforge.net/|title=PLife Home Page|accessdate=May 22, 2009}}</ref>

By analogy with the corresponding fairy chess pieces, spaceships of types (3m,m)/n, (3m,2m)/n and (4m,m)/n would presumably be called camelships, zebraships and giraffeships, respectively.

Alternatively, 'knightship' may refer to any spaceship that travels in an oblique direction (not diagonally or orthogonally). The first oblique spaceship to be discovered, [[Gemini]], was found in May, [[:category:patterns found in 2010|2010]] with a velocity of [[:Category:Spaceships with speed 2560c/16849793|(5120,1024)c/33699586]]. In June, 2010 [[Dave Greene]] constructed the first true knightship in Life, which is based on Gemini and travels at a velocity of (4096,8192)/c35567490.<ref>[http://www.conwaylife.com/forums/viewtopic.php?f=2&t=406&start=25a#p2578 post] on the conwaylife.com forums</ref>

==Non-monotonic spaceship==
A spaceship is said to be '''non-monotonic''' if its [[bounding_box#Leading_edge|leading edge]] falls back in some [[generation]]s. The first non-monotonic spaceship to be found was the diagonal [[13-engine Cordership]], by [[Dean Hickerson]] in April [[:Category:Patterns found in 1991|1991]]. The [[non-monotonic spaceship 1|first orthogonal example]] was found by [[:Category:Patterns found by Hartmut Holzwart|Hartmut Holzwart]] in August [[:Category:Patterns found in 1992|1992]], which has period [[:Category:Spaceships with period 4|4]] and travels at speed [[:Category:Spaceships with speed c/4|c/4]]. In April [[:Category:Patterns found in 1994|1994]], Holzwart found examples of period [[:Category:Spaceships with period 3|3]] spaceships with this property, and this is clearly the smallest possible period. Another well-known non-monotonic spaceship is the [[weekender]]. [[114p6h1v0]]'s front part is non-monotonic, and so is the whole ship (unless its corresponding pushalong is introduced).

==Smoking ship==
A '''smoking ship''' is a spaceship that produces [[smoke]]. If the smoke extends past the edge of the rest of the spaceship, then it can be used to perturb other objects as the spaceship passes by. Running [[glider]]s into the smoke is often a good way to turn or duplicate them, or convert them into other objects. Sometimes the smoke from a smoking ship may itself be perturbed by accompanying spaceships in order to form a puffer. Simple examples of a smoking ship are [[Schick engine]] and [[Coe ship]]. Sometimes combinations of smoking tagalongs are puffers - such as a P48 blinker puffer produced by attaching two Coe engines to LWSS's pulling the Schick engine.

==Standard spaceship==
A '''standard spaceship''' is a [[glider]], [[lightweight spaceship]], [[middleweight spaceship]], or [[heavyweight spaceship]]. That is, it is one of the original spaceships that have been known since [[:Category:patterns found in 1970|1970]]. Many failed standard spaceships like the [[overweight spaceship]] and the [[b-heptomino]] as well as the hassled object in the [[roteightor]] also display standard-like behavior and can be hassled. A '''non-standard spaceship''' is any other spaceship.

==See also==
* [[:Category:Glide symmetric spaceships|List of glide symmetric spaceships]]
* [[:Category:Non-monotonic spaceships|List of non-monotonic spaceships]]
* [[:Category:Smoking ships|List of smoking ships]]
* [[Spaceship terminology]]
* [[Tagalong]]

==References==
<references />

==External links==
*[http://www.argentum.freeserve.co.uk/lex.htm The Life Lexicon]
[[Category:Everything else]]

Types of spaceships

2013-12-22T04:15:41Z

Alex79:

{{Glossary}}
There are many different '''types of [[spaceships]]''' in [[Conway's Game of Life]] and related [[cellular automaton|automata]]. The following are the terminology that are in common use. This page contains only very general terminology that applies to wide varieties of spaceships.

==Edge-repair spaceship==
An '''edge-repair spaceship''' is a spaceship that has an edge that possesses no [[spark]] and yet is able to perturb things because of its ability to repair certain types of damage to itself. The most useful example is [[edge-repair spaceship 1]], which can destroy [[Herschel]]s as it travels. Another well-known example is [[edge-repair spaceship 2]], which can destroy [[beehive]]s.

==Flipper==
A '''flipper''' is a spaceship (or [[oscillator]]) that forms its mirror image halfway through its [[period]]. All flipper spaceships are [[#Glide symmetric spaceship|glide symmetric]] and conversely all glide symmetric spaceships are flippers. The most common examples are the [[glider]], [[lightweight spaceship]], [[middleweight spaceship]], and [[heavyweight spaceship]].

==Flotilla==
A [[Spaceship flotilla|'''flotilla''']] is a spaceship composed of a number of smaller interacting spaceships. Often one or more of these is not a true spaceship and could not survive without the support of the others. [[Flotilla 1]] is the most common example, and it contains an [[overweight spaceship]] escorted by two [[heavyweight spaceship]]s.

==Frothing spaceship==
A '''frothing spaceship''' is a spaceship whose back end appears to be unstable and breaking apart, but which nonetheless survives (compare with [[frothing puffer]]). The exhaust festers and clings to the back of the spaceship before breaking off.

==Glide symmetric spaceship==
A spaceship is said to be '''glide symmetric''' if it undergoes [[reflection]] and [[translation]] simultaneously. It is not difficult to show that a spaceship is glide symmetric if and only if it is a [[#Flipper|flipper]].

==Knightship==
[[Image:AlmostKnightship.png|framed|right|An "almost knightship"<br />{{JavaRLE|almostknightship}}]]A '''knightship''' is a spaceship of type (2m,m)/n (that is, a spaceship that moves two [[cell]]s horizontally for every one cell it moves vertically). Knightships must be asymmetric and their period must be at least 6, which makes searching for them using programs like [[lifesrc]] very difficult. An "almost knightship" was found by [[Eugene Langvagen]] on March 23, [[:Category:Patterns found in 2004|2004]], which would be a period-6 knightship if it weren't for two cells that are incorrect in its sixth generation.<ref>{{cite web|url=http://plife.sourceforge.net/|title=PLife Home Page|accessdate=May 22, 2009}}</ref>

By analogy with the corresponding fairy chess pieces, spaceships of types (3m,m)/n, (3m,2m)/n and (4m,m)/n would presumably be called camelships, zebraships and giraffeships, respectively.

Alternatively, 'knightship' may refer to any spaceship that travels in an oblique direction (not diagonally or orthogonally). The first oblique spaceship to be discovered, [[Gemini]], was found in May, [[:category:patterns found in 2010|2010]] with a velocity of [[:Category:Spaceships with speed 2560c/16849793|(5120,1024)c/33699586]]. In June, 2010 [[Dave Greene]] constructed the first true knightship in Life, which is based on Gemini and travels at a velocity of (4096,8192)/c35567490.<ref>[http://www.conwaylife.com/forums/viewtopic.php?f=2&t=406&start=25a#p2578 post] on the conwaylife.com forums</ref>

==Non-monotonic spaceship==
A spaceship is said to be '''non-monotonic''' if its [[bounding_box#Leading_edge|leading edge]] falls back in some [[generation]]s. The first non-monotonic spaceship to be found was the diagonal [[13-engine Cordership]], by [[Dean Hickerson]] in April [[:Category:Patterns found in 1991|1991]]. The [[non-monotonic spaceship 1|first orthogonal example]] was found by [[:Category:Patterns found by Hartmut Holzwart|Hartmut Holzwart]] in August [[:Category:Patterns found in 1992|1992]], which has period [[:Category:Spaceships with period 4|4]] and travels at speed [[:Category:Spaceships with speed c/4|c/4]]. In April [[:Category:Patterns found in 1994|1994]], Holzwart found examples of period [[:Category:Spaceships with period 3|3]] spaceships with this property, and this is clearly the smallest possible period. Another well-known non-monotonic spaceship is the [[weekender]]. [[114p6h1v0]]'s front part is non-monotonic, and so is the whole ship (unless its corresponding pushalong is introduced).

==Smoking ship==
A '''smoking ship''' is a spaceship that produces [[smoke]]. If the smoke extends past the edge of the rest of the spaceship, then it can be used to perturb other objects as the spaceship passes by. Running [[glider]]s into the smoke is often a good way to turn or duplicate them, or convert them into other objects. Sometimes the smoke from a smoking ship may itself be perturbed by accompanying spaceships in order to form a puffer. Simple examples of a smoking ship are [[Schick engine]] and [[Coe ship]]. Sometimes combinations of smoking tagalongs are puffers - such as a P48 blinker puffer produced by attaching two Coe engines to LWSS's pulling the Schick engine.

==Standard spaceship==
A '''standard spaceship''' is a [[glider]], [[lightweight spaceship]], [[middleweight spaceship]], or [[heavyweight spaceship]]. That is, it is one of the original spaceships that have been known since [[:Category:patterns found in 1970|1970]]. Many failed standard spaceships like the [[overweight spaceship]] and the [[b-heptomino]] also display standard-like behavior and can be hassled. A '''non-standard spaceship''' is any other spaceship.

==See also==
* [[:Category:Glide symmetric spaceships|List of glide symmetric spaceships]]
* [[:Category:Non-monotonic spaceships|List of non-monotonic spaceships]]
* [[:Category:Smoking ships|List of smoking ships]]
* [[Spaceship terminology]]
* [[Tagalong]]

==References==
<references />

==External links==
*[http://www.argentum.freeserve.co.uk/lex.htm The Life Lexicon]
[[Category:Everything else]]

Underweight spaceship

2013-10-25T00:14:27Z

Alex79: made page

The underweight spaceship is a length 3 [[standard spaceship]]-like [[fleet]] predecessor. Unlike the [[overweight spaceship]], which demonstrates normal behavior of dense and thin phases until the [[blinker]] explodes it, this explodes after copying itself unsuccessfully in generation 1 in a way similar to the [[lumps of muck]]. However it can still demonstrate typical dense and thin phases when supported by 4 copies of an [[eater 1]] or another underweight spaceship as shown in [[roteightor]] and its extension.

Moon

2013-10-15T03:42:04Z

Alex79: Undo revision 18250 by Alex79 (talk)

{{Spaceship|name=Moon|pname=moon|dir=Orthogonal|p=1|s=c|c=4|bx=2|by=4|h=4|rulespecial=[[Seeds]], [[Live Free or Die]]|rulemin=B2/S|rulemax=B245678/S0345678|animated=true}}
The '''Moon''' is the third most common spaceship in [[Seeds]] and it is also one of the most common spaceships in several B2-based rules including [[Live Free or Die]].

Moon

2013-10-15T03:34:45Z

Alex79:

{{Spaceship|name=Moon|pname=grin|dir=Orthogonal|p=1|s=c|c=4|bx=2|by=4|h=4|rulespecial=[[Seeds]], [[Live Free or Die]]|rulemin=B2/S|rulemax=B245678/S0345678|animated=true}}
The '''Moon''' is the third most common spaceship in [[Seeds]] and it is also one of the most common spaceships in several B2-based rules including [[Live Free or Die]].

File:UnknownPattern.png

2013-10-15T03:25:18Z

Alex79: Blanked the page

File:UnknownPattern.png

2013-10-15T03:24:48Z

Alex79:

[[File:grin.png]]