LifeWiki - User contributions [en]

Pi wave (disambiguation)

2012-03-07T15:53:04Z

Beebop:

A line of [[Pi|pi-heptominoes]] stabilizing one another.

Pi wave (disambiguation)

2012-03-07T15:52:26Z

Beebop:

A line of [[pi-heptominoes]] stabilizing one another.

User:Gameoflifeboy/Flip flop X

2012-02-12T21:35:05Z

Beebop:

This is a class of oscillators in the rule [[2x2]] that are, at generation 0, 2 cells wide. Not all Nx2 rectangles oscillate, though. The name comes from the fact that halfway through the period, the starting pattern appears rotated 90 degrees.

3-engine Cordership

2011-10-16T20:52:08Z

Beebop: /* Image gallery */

{{Spaceship|type=Cordership|name=3-engine Cordership|pname=3enginecordership|dir=Diagonal|p=96|s=c/12|c=149|bx=58|by=65|discoverer=Paul Tooke|discoveryear=2004|h=156.1|life105=true|life106=true|plaintext=true|rle=true|synthesis=15|synthesisRLE=true}}
The '''3-engine Cordership''' is a diagonal [[:Category:Spaceships with speed c/12|c/12]] [[spaceship]] that was discovered by [[:Category:Patterns found by Paul Tooke|Paul Tooke]] on January 12, [[:Category:Patterns found in 2004|2004]]. It is the [[Cordership]] that uses the fewest number of known possible [[switch engine]]s, though the [[4-engine Cordership]] is smaller in terms of minimum population. [[:Category:Patterns found by David Bell|David Bell]] discovered in [[:Category:Patterns found in 2005|2005]] that it can be used to turn a [[lightweight spaceship]] 90 degrees as shown below.<ref>{{cite web|url=http://pentadecathlon.com/lifeNews/2005/06/new_compact_corderships.html |title=New Compact Corderships |publisher=Dave Greene |date=June 18, 2005|accessdate=June 10, 2009}}</ref> It can be [[glider synthesis|constructed]] with only 15 [[glider]]s, and Tooke created a [[gun]] for this spaceship only a week after its original construction (see [[3-engine Cordership gun]]).

The 3-engine Cordership can easily be destroyed by three [[eater 2]]s and four [[block]]s, as shown below. This cleanup reaction was found by [[Jason Summers]].

==Incremental construction==

[[Dave Greene]] discovered a glider synthesis for upgrading a [[switch engine]] to a wing, which can be repeated to form the complete Cordership. Adam P. Goucher then built a Herschel conduit to convert a glider into a 3-engine Cordership.<ref>{{cite web|url=http://b3s23life.blogspot.com/2009/02/first-complete-glider-to-cordership.html |title=First complete glider-to-Cordership converter |publisher=Dave Greene |date=February 7, 2009 |accessdate=June 15, 2009}}</ref>

==Image gallery==
{|
|-
|[[Image:3enginecordershipeater.png|framed|left|3-engine Cordership eater. It is possible to replace the eater2s with eater1s.<br />{{JavaRLE|3enginecordershipeater|brief}}]]
|[[Image:3enginecordershiplwssreflect.png|framed|left|3-engine Cordership about to reflect a lightweight spaceship by 90 degrees<br />{{JavaRLE|3enginecordershiplwssreflection|brief}}]]
|}

==See also==
*[[3-engine Cordership rake]]
*[[Sawtooth 260]]

==References==
<references />
[[Category:glide symmetric spaceships]]

Kickback reaction

2011-10-15T23:33:40Z

Beebop:

The following collision of two gliders whose product is a single glider travelling in the opposite direction to one of the original gliders. This is important in the proof of the existence of a [[universal constructor]], and in Bill Gosper's [[total aperiodic]], as well as a number of other constructions.

.....O..
......OO
.OO..OO.
O.O.....
..O.....

Pulsar 18-22-20

2011-10-09T14:47:48Z

Beebop: Redirected page to Pulsar quadrant

#REDIRECT [[Pulsar_quadrant]]

Pulsar CP 48-56-72

2011-10-09T14:47:16Z

Beebop: Redirected page to Pulsar

#REDIRECT [[Pulsar]]

Tagalong

2011-10-09T01:38:14Z

Beebop: Fixed some grammatical errors

__NOTOC__{{Glossary}}
A '''tagalong''' (or less commonly a '''tugalong'''<ref>{{Cite web|url=http://www.argentum.freeserve.co.uk/lex_t.htm#tugalong|title=Tugalong|publisher=The Life Lexicon|author=Stephen Silver|accessdate=May 14, 2009}}</ref>) is an object that is not a [[spaceship]] by itself, but can be attached to one or more spaceships to form a larger spaceship. For example, [[Canada goose]] is a spaceship made by attaching a tagalong to the back of a [[glider]]. Well-known tagalongs include [[fly]], [[sidecar]], and [[sparky]].

==Pushalong==
A '''pushalong''' is a tagalong that is located at the front of the spaceship that it is attached to. [[Pushalong 1]] is an example that was found by [[:Category:Patterns found by David Bell|David Bell]] in [[:Category:Patterns found in 1992|1992]] that can be attached to the front of a [[middleweight spaceship]].<ref>{{Cite web|url=http://www.argentum.freeserve.co.uk/lex_p.htm#pushalong|title=Pushalong|publisher=The Life Lexicon|author=Stephen Silver|accessdate=May 22, 2009}}</ref> Another pushalong can be seen at [[114P6H1V0]].

==Still life tagalong==
[[Image:Stilllifetagalong.png|framed|right|A still life tagalong<br />{{JavaRLE|stilllifetagalong|brief}}]]A '''still life tagalong''' is a tagalong that takes the form of a [[still life]] in at least one [[phase]]. An example is shown to the right in which the tagalong looks like a [[pond]].<ref>{{Cite web|url=http://www.argentum.freeserve.co.uk/lex_s.htm#stilllifetagalong|title=Still life tagalong|publisher=The Life Lexicon|author=Stephen Silver|accessdate=May 22, 2009}}</ref>

==See also==
*[[:Category:Tagalongs|List of tagalongs]]
*[[Schick engine]]

==References==
<references />

==External links==
{{LinkWeisstein|Tagalong.html}}
{{LinkLexicon|lex_t.htm#tagalong}}

Anteater

2011-10-09T01:24:59Z

Beebop: Removed outdated content.

An '''anteater''' is a pattern that eats [[ant]]s and can be stationary (such as the stabilization in [[electric fence]]) or moving. Moving anteaters have been found for the speeds of [[c/4 orthogonal]] and [[c/4 diagonal]], the diagonal case eating an oblique row of ants.

==See also==
*[[Wickstretcher 1]]

==External links==
{{LinkLexicon|lex_a.htm#anteater}}

Obo! spark

2011-10-09T01:16:44Z

Beebop:

A [[Spark|spark]] of the form O.O (so called after its rle encoding).

From the [http://argentum.freeserve.co.uk/lex_o.htm#Obo_spark Life Lexicon]

User:H. V. McIntosh/Herparium

2011-10-09T01:15:32Z

Beebop: Changed the headers and fixed some spellings.

Examination of the patterns exhibited in the numerous catalogs of Life artifacts readily leads to the conclusion that patterns frequently occur in families. While designs resulting from mere repetition of smaller patterns are routinely excluded from catalogs, there are types of close contact impeding further dissection yet still preserving a discernible shape. Although often referred to as extensible patterns, the use of regular expressions permits an exact yet compact description of the family. They may be discerned empirically once having examined several configurations, or be found more systematically by examining loops in de Bruijn diagrams.

The '''Snake''' is a common, seemingly innocent, lifeform which nevertheless participates in at least three kinds of extensions; moreover they may be mixed, resulting in ever more elaborate snakes -- long snakes, siamese snakes, and so on. Several extensions and their regular expressions are discussed below.

==Image gallery==
===Horizontal snake extension===

<gallery>
Image:snake.png|a simple lonely snake
Image:snake.png|but here's another
Image:snakesiamesesnake.png|and even a siamese pair
</gallery>

From this simple sequence a pattern can already be discerned. The nucleus, N, of the pattern is a square with occupied cells on its diagonal and empty cells on the antidiagonal. Those squares are bounded to the left and right by vertical live dominoes D, but only one single domino separates two succesive nuclei. Therefore the regular expression D (N D)*, equivalently (D N)* D, represents a snake with an arbitrarily long row of segments (vertebrae?). However, * = 0 leaves only a single standing domino which is not a still life; regular expression syntax would avoid this possibility by writing + rather than *, iteration then starting from 1, not 0.
===Diagonal snake extension===
<gallery>
Image:snake.png|a simple lonely snake
Image:longsnake.png|but this one's grown a bit
Image:longlongsnake.png|and still some more
</gallery>
This time the nucleus is a single live cell, s, but there are two end pieces, an upper 3/4 block L and a lower 3/4 block R; altogether producing the regular expression L s* R. This time * = 0 is valid, correctly revealing the primordial snake. Interestingly, when Adam named the animals, it is this menangerie which he seems to have had in mind.
===Diagonal ship extension===
<gallery>
Image:ship.png|a lonely ship
Image:longship.png|but this one's grown a bit
Image:longlongship.png|very long ship
</gallery>
===Diagonal tub extension===
<gallery>
Image:tub.png|a lonely tub
Image:barge.png|but now it's a barge
Image:longbarge.png|and a barge for ever after
</gallery>

The difference between ships and snakes is the difference between a double or single diagonal; both have the same tail and head, which are just differently notched blocks. A doubly notched block is also feasible, leading to the tub-barge-long barge-longer barge sequence. In turn, selection of the body and the terminals determines the alphabet to be used by the regular expression describing the combination. The actual tiles represented by an alphabet of roman letters can be connected in various ways, all resulting in a linear structure or frieze. So points of contact must be designated along with the shape of the tiles.

===Oblique aircraft carrier extension===
<gallery>
Image:ship.png|a ship once again
Image:aircraftcarrier.png|split by a diagonal skip
Image:carriersiamesecarrier.png|then by repeatable spacers
</gallery>

Possible connections already have names: bridge, tie, weld, but even these need to be specified in greater detail. Every exterior boundary edge in a still life is a potential edge, just as every exterior vertex could be the site of a tie. More precisely, if there are only two live neighbors of a cell just inside the boundary, that cell could also live if there were an additional live neighbor right outside the boundary.

Shims give additional flexibility to description by regular expression; although lacking cells they can carry points for ties to other tiles or marked edges for bridge placement. By marking a strategic tie point on the two bounding 3/4 blocks, L and R, a single live cell with diagonally opposite tie points s will generate snakes via the regular expression L s* R, although * = 0 just gives back a ship which might not want to be called a snake. A three cell high vertical line H with the top line left sensitized and the bottom segment right sensitized will generate a stairstep. Together with a welded RL tread T = (0 1 1, 1 1 0), they will generate the relatively unnamed aircraft carrier sequence L (H T)* H R.

===Parseltongue===
Several letters for a regular expression alphabet have now been introduced:
*L is a notched block w/ notch at lower right; tips tie sensitive, right edge bridge sensitive
*R is a notched block w/ notch at upper left; tips tie sensitive, left edge bridge sensitive
*s is a single live cell; opposite diagonal corners tie sensitive
*S is twin live cells, joined antidiagonally; diagonally opposite corners tie sensitive
*T is a tread; equivalent to a welded LR
*H is a riser; three cells high, top bridges to left, bottom to right
*D is a vertical domino;
Introducing a backspace could induce welding; in any event there is enough grammar present to allow a parselmouth to speak with a forked tongue. So far the discussion has not exhausted the possible letters for an extended alphabet, but enough has been shown to recognize many families amongst the catalogued still life patterns.
[[Category:Everything else]]

First natural glider

2011-10-09T00:41:23Z

Beebop: Created page with "The '''first natural glider''' is the first glider released by a Herschel. It is the main limiting factor in Herschel track compression. An eater5 var..."

The '''first natural glider''' is the first [[glider]] released by a Herschel. It is the main limiting factor in Herschel track compression. An [[Tub-with-tail_eater|eater5]] variant is the method of choice for the deletion, but some new sparkers might be able to "reach in" and delete the glider faster than the eater5.
==See also==
*[[Herschel]]
*[[B_track|Herschel track]]

HWSS emulator

2011-10-09T00:32:32Z

Beebop: Redirected page to Heavyweight emulator

#REDIRECT [[Heavyweight_emulator]]

P30 shuttle

2011-10-09T00:31:25Z

Beebop: Redirected page to Queen bee shuttle

#REDIRECT [[Queen_bee_shuttle]]

P46 shuttle

2011-10-09T00:30:52Z

Beebop: Redirected page to Twin bees shuttle

#REDIRECT [[Twin_bees_shuttle]]

P46 shuttle

2011-10-09T00:30:26Z

Beebop: Redirected page to Queen bee shuttle

#REDIRECT [[Queen_bee_shuttle]]

Honeybit

2011-10-08T20:02:18Z

Beebop: Flxed headers

{{Pattern|name=Honeybit|pname=honeybit|bx=4|by=8|discoverer=Brice Due|discoveryear=2006|rle=false}}

The '''honeybit''' reaction is an elegant destructive-read [[memory]] used by Brice Due in his [[OTCA_metapixel|metapixel]]. It involves a glider colliding with a [[beehive]] (hence the name "honeybit"), that converts it to a block and pond. The block and pond can then be hit with a [[LWSS]] that converts the block and pond back to a beehive in the ''exact same location''!
==As a HWSS eater==
There is a possibly more elegant reaction with the block and pond that eats a [[HWSS]] by converting the block and pond to a beehive and glider, ''which then triggers the honeybit reaction!''

==External links==
* [http://otcametapixel.blogspot.com OTCAMP Homepage]

Obo! spark

2011-10-08T20:00:48Z

Beebop: Fixed link to point to 'obo spark'

A spark of the form O.O (so called after its rle encoding).

From the [http://argentum.freeserve.co.uk/lex_o.htm#Obo_spark Life Lexicon]

Obo! spark

2011-10-08T19:59:46Z

Beebop:

A spark of the form O.O (so called after its rle encoding).

From the [http://argentum.freeserve.co.uk/lex.htm Life Lexicon]

Obo! spark

2011-10-08T19:59:28Z

Beebop: Created page with "==Obo spark== A spark of the form O.O (so called after its rle encoding). From the [http://argentum.freeserve.co.uk/lex.htm Life Lexicon]"

==Obo spark==
A spark of the form O.O (so called after its rle encoding).

From the [http://argentum.freeserve.co.uk/lex.htm Life Lexicon]

Honeybit

2011-10-08T15:38:02Z

Beebop:

{{Pattern|name=Honeybit|pname=honeybit|bx=4|by=8|discoverer=Brice Due|discoveryear=2006|rle=false}}
==Honeybit==

The '''honeybit''' reaction is an elegant destructive-read [[memory]] used by Brice Due in his [[OTCA_metapixel|metapixel]]. It involves a glider colliding with a [[beehive]] (hence the name "honeybit"), that converts it to a block and pond. The block and pond can then be hit with a [[LWSS]] that converts the block and pond back to a beehive in the ''exact same location''!
==As a HWSS eater==
There is a possibly more elegant reaction with the block and pond that eats a [[HWSS]] by converting the block and pond to a beehive and glider, ''which then triggers the honeybit reaction!''

==External links==
* [http://otcametapixel.blogspot.com OTCAMP Homepage]

Honeybit

2011-10-08T15:37:41Z

Beebop: Created page with "{{Pattern|name=Honeybit|pname=honeybit|c=6/12|bx=4|by=8|discoverer=Brice Due|discoveryear=2006|rle=false}} ==Honeybit== The '''honeybit''' reaction is an elegant destructive-rea..."

{{Pattern|name=Honeybit|pname=honeybit|c=6/12|bx=4|by=8|discoverer=Brice Due|discoveryear=2006|rle=false}}
==Honeybit==

The '''honeybit''' reaction is an elegant destructive-read [[memory]] used by Brice Due in his [[OTCA_metapixel|metapixel]]. It involves a glider colliding with a [[beehive]] (hence the name "honeybit"), that converts it to a block and pond. The block and pond can then be hit with a [[LWSS]] that converts the block and pond back to a beehive in the ''exact same location''!
==As a HWSS eater==
There is a possibly more elegant reaction with the block and pond that eats a [[HWSS]] by converting the block and pond to a beehive and glider, ''which then triggers the honeybit reaction!''

==External links==
* [http://otcametapixel.blogspot.com OTCAMP Homepage]

File:Honeybit.gif

2011-10-08T15:19:05Z

Beebop: Honeybit reaction.

Honeybit reaction.

Dot

2011-10-08T14:59:34Z

Beebop: Redirected page to Cell

#REDIRECT [[Cell]]

LWSS emulator

2011-10-08T14:57:53Z

Beebop: Redirected page to Lightweight emulator

#REDIRECT [[Lightweight_emulator]]