Difference between revisions of "Snark"
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|discoverer = Mike Playle | |discoverer = Mike Playle | ||
|discoveryear = 2013 | |discoveryear = 2013 | ||
|synthesis = | |synthesis = 21 | ||
|synthesisRLE = true | |synthesisRLE = true | ||
|rulemin = B3/S23 | |||
|rulemax = B38/S238 | |||
|rulespecial = [[Conway's Game of Life|Conway Life]], [[Pedestrian Life]] | |||
|isorulemin = B3/S23 | |||
|isorulemax = B34c8/S234c5e6n8 | |||
|plaintext = true | |||
|rle = true | |rle = true | ||
|viewerconfig = #C [[ WIDTH 600 HEIGHT 600 X 3 Y -3 THUMBSIZE 2 ZOOM 20 GPS 30 LOOP 128 ]] | |viewerconfig = #C [[ WIDTH 600 HEIGHT 600 X 3 Y -3 THUMBSIZE 2 ZOOM 20 GPS 30 LOOP 128 ]] | ||
|apgcode = xs49_wc9b88gy9o8zg88mlldxooy3321z11074zy5c453 | |||
}} | }} | ||
The ''' | The '''Snark''' is a 90° [[Stable reflector|stable glider reflector]] discovered by [[Mike Playle]] on April 25, {{year|2013}}.<ref name="post7819" /> It is made up of two [[eater 1]]s, a [[block]] and a [[31.4]], the "heart" of the Snark. It is currently the fastest and the smallest 90° stable [[glider]] reflector, both in terms of the [[population]] and the [[bounding box]]. Another commonly-used stabilization of the [[catalyst]] is 34 bits, and many other variants are available. For a [[color-changing]] one, see the reflector in the [[stable reflector]] article, or a periodic [[bouncer]] . | ||
{{EmbedViewer | {{EmbedViewer | ||
|position = center | |position = center | ||
|viewerconfig = #C [[ THEME 6 GRID GRIDMAJOR 0 ZOOM 8 HEIGHT 480 THUMBLAUNCH THUMBSIZE 2 ]] | |viewerconfig = #C [[ THEME 6 GRID GRIDMAJOR 0 ZOOM 8 HEIGHT 480 THUMBLAUNCH THUMBSIZE 2 ]] | ||
|pname = | |pname = snarkcatalystvariants | ||
|caption = four Snark catalyst variants | |caption = four Snark catalyst variants<br><div align="left"> | ||
<pre>Top: original variant | <pre>Top: Mike Playle (original variant) | ||
Left: Shannon Omick (better clearance on a diagonal) | Left: Shannon Omick (better clearance on a diagonal) | ||
Right: Heinrich Koenig (better clearance on a different diagonal) | Right: Heinrich Koenig (better clearance on a different diagonal) | ||
| Line 28: | Line 35: | ||
}} | }} | ||
The base reaction was discovered by [[Dietrich Leithner]] about 1998, but it consumed another block.<ref | The base [[reaction]] was discovered by [[Dietrich Leithner]] about {{year|1998}}, but it consumed another block.<ref name="post1939" /> A catalyst that could replace the block was found with [[Bellman]], a program for searching catalytic reactions developed by Mike Playle. | ||
Given its small [[repeat time]], the | Given its small [[repeat time]], the Snark enabled [[oscillator]]s of previously unknown [[period]]s of {{period|43|brief}} and {{period|53|brief}} to be constructed.<ref name="post7820" /> It also made most large symmetrical [[Herschel loop]] [[gun]]s obsolete, since it is now possible to make use of the [[Herschel]] gliders with a shorter path of the Herschel track itself.<ref name="post7901" /> | ||
It also made most large symmetrical Herschel | |||
[[File:p4_snark.png|200px|thumb|center|The period 4 | [[File:p4_snark.png|200px|thumb|center|The period-4 reflector with repeat time 52 was used for p52+4n glider streams before the Snark was discovered.]] | ||
The Snark was voted [[Pattern of the Year]] 2013 in a belated vote held in 2018 on the [[ConwayLife.com]] forums.<ref name="post58573" /> | |||
== See also == | |||
* [[Snarkmaker]] | |||
* [[Snarkbreaker]] | |||
== References == | == References == | ||
<references/> | <references> | ||
<ref name="post7819">{{LinkForumThread | |||
|format = ref | |||
|title = Just the place for a Snark! | |||
|p = 7819 | |||
|author = Mike Playle | |||
|date = April 25, 2013 | |||
}}</ref> | |||
<ref name="post1939">{{LinkForumThread | |||
|format = ref | |||
|title = Re: Incomplete search patterns - try to complete | |||
|p = 1939 | |||
|author = Adam P. Goucher | |||
|date = February 17, 2010 | |||
}}</ref> | |||
<ref name="post7820">{{LinkForumThread | |||
|format = ref | |||
|title = Re: Just the place for a Snark! | |||
|p = 7820 | |||
|author = Matthias Merzenich | |||
|date = April 25, 2013 | |||
}}</ref> | |||
<ref name="post7901">{{LinkForumThread | |||
|format = ref | |||
|title = Re: Just the place for a Snark! | |||
|p = 7901 | |||
|author = Dave Greene | |||
|date = May 4, 2013 | |||
}}</ref> | |||
<ref name="post58573">{{LinkForumThread | |||
|format = ref | |||
|title = Re: Belated Pattern of the Year 2013 competition: Voting | |||
|p = 58573 | |||
|author = 77topaz | |||
|date = March 29, 2018 | |||
}}</ref> | |||
</references> | |||
== External links == | == External links == | ||
{{LinkLexicon|lex_s.htm#snark}} | {{LinkLexicon|lex_s.htm#snark}} | ||
{{LinkCatagolue|xs49_wc9b88gy9o8zg88mlldxooy3321z11074zy5c453|format=pseudo-object}} | |||
Revision as of 09:33, 12 May 2020
| Snark | |||||||||||
| View static image | |||||||||||
| Pattern type | Stable reflector | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Number of cells | 52 | ||||||||||
| Bounding box | 23 × 17 | ||||||||||
| Angle | 90° | ||||||||||
| Repeat time | 43 | ||||||||||
| Discovered by | Mike Playle | ||||||||||
| Year of discovery | 2013 | ||||||||||
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The Snark is a 90° stable glider reflector discovered by Mike Playle on April 25, 2013.[1] It is made up of two eater 1s, a block and a 31.4, the "heart" of the Snark. It is currently the fastest and the smallest 90° stable glider reflector, both in terms of the population and the bounding box. Another commonly-used stabilization of the catalyst is 34 bits, and many other variants are available. For a color-changing one, see the reflector in the stable reflector article, or a periodic bouncer .
four Snark catalyst variantsTop: Mike Playle (original variant) Left: Shannon Omick (better clearance on a diagonal) Right: Heinrich Koenig (better clearance on a different diagonal) Bottom: Simon Ekström (better clearance on two diagonals) (click above to open LifeViewer) RLE: here Plaintext: here |
The base reaction was discovered by Dietrich Leithner about 1998, but it consumed another block.[2] A catalyst that could replace the block was found with Bellman, a program for searching catalytic reactions developed by Mike Playle.
Given its small repeat time, the Snark enabled oscillators of previously unknown periods of 43 and 53 to be constructed.[3] It also made most large symmetrical Herschel loop guns obsolete, since it is now possible to make use of the Herschel gliders with a shorter path of the Herschel track itself.[4]
The Snark was voted Pattern of the Year 2013 in a belated vote held in 2018 on the ConwayLife.com forums.[5]
See also
References
- ↑ Mike Playle (April 25, 2013). Just the place for a Snark! (discussion thread) at the ConwayLife.com forums
- ↑ Adam P. Goucher (February 17, 2010). Re: Incomplete search patterns - try to complete (discussion thread) at the ConwayLife.com forums
- ↑ Matthias Merzenich (April 25, 2013). Re: Just the place for a Snark! (discussion thread) at the ConwayLife.com forums
- ↑ Dave Greene (May 4, 2013). Re: Just the place for a Snark! (discussion thread) at the ConwayLife.com forums
- ↑ 77topaz (March 29, 2018). Re: Belated Pattern of the Year 2013 competition: Voting (discussion thread) at the ConwayLife.com forums
External links
- Snark at the Life Lexicon
- Snark at Adam P. Goucher's Catagolue (pseudo-object)