Difference between revisions of "Snark"

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m (Typo fix. I'm a little worried that this paragraph doesn't describe a useful reaction, and there are a lot of trivial coincidences like this that _could_ be documented but probably shouldn't be.)
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|discoverer  = Mike Playle
 
|discoverer  = Mike Playle
 
|discoveryear = 2013
 
|discoveryear = 2013
|synthesis    = 22
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|synthesis    = 21
 
|synthesisRLE = true
 
|synthesisRLE = true
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|rulemin      = B3/S23
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|rulemax      = B38/S238
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|rulespecial  = [[Conway's Game of Life|Conway Life]], [[Pedestrian Life]]
 +
|isorulemin  = B3/S23
 +
|isorulemax  = B34c8/S234c5e6n8
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|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 ]]
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|apgcode      = xs49_wc9b88gy9o8zg88mlldxooy3321z11074zy5c453
 
}}
 
}}
The '''snark''' is a 90° [[Stable reflector|stable glider reflector]] discovered by [[Mike Playle]] in April 2013.<ref>{{cite web|url=http://conwaylife.com/forums/viewtopic.php?p=7819#p7819|title=Just the place for a Snark!|author=Mike Playle|date=April 25, 2013|accessdate=March 27, 2016}}</ref> It is made up of two [[Eater_1|eaters]], a [[block]] and a 31-bit [[still life]], 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.
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The '''Snark''' is a 90° [[Stable reflector|stable glider reflector]] discovered by [[Mike Playle]] on April 25, {{year|2013}}.<ref>{{cite web|url=http://conwaylife.com/forums/viewtopic.php?p=7819#p7819|title=Just the place for a Snark!|author=Mike Playle|date=April 25, 2013|accessdate=March 27, 2016}}</ref> It is made up of two [[Eater_1|eaters]], 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 use a [[bouncer]] (periodic).
  
 
{{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        = snarkcatalystvariants‎
+
|pname        = snarkcatalystvariants
 
|caption      = four Snark catalyst variants --<br /><div align="left">
 
|caption      = four Snark catalyst variants --<br /><div align="left">
 
<pre>Top:  original variant by Mike Playle
 
<pre>Top:  original variant by Mike Playle
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}}
 
}}
  
The base reaction was discovered by [[Dietrich Leithner]] about 1998, but it consumed another block.<ref>{{Cite web|url=http://www.conwaylife.com/forums/viewtopic.php?f=2&t=335#p1939|title=Re: Incomplete search patterns - try to complete|author=Adam P. Goucher|date=February 17, 2010|accessdate=May 8, 2013}}</ref> A [[catalyst]] that could replace the block was found with [[Bellman]], a program for searching catalytic reactions developed by [[Mike Playle]].
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The base reaction was discovered by [[Dietrich Leithner]] about {{year|1998}}, but it consumed another block.<ref>{{Cite web|url=http://www.conwaylife.com/forums/viewtopic.php?f=2&t=335#p1939|title=Re: Incomplete search patterns - try to complete|author=Adam P. Goucher|date=February 17, 2010|accessdate=May 8, 2013}}</ref> 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 made [[oscillator]]s of previously unknown periods of [[:Category:Oscillators with period 43|43]] and [[:Category:Oscillators with period 53|53]] trivial.<ref>{{cite web|url=
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Given its small [[repeat time]], the Snark made [[oscillator]]s of previously unknown periods of {{period|43|brief}} and {{period|53|brief}} trivial.<ref>{{cite web|url=
 
http://conwaylife.com/forums/viewtopic.php?p=7820#p7820|title=Re: Just the place for a Snark!|author=Matthias Merzenich|date=April 25, 2013|accessdate=March 27, 2016}}</ref>
 
http://conwaylife.com/forums/viewtopic.php?p=7820#p7820|title=Re: Just the place for a Snark!|author=Matthias Merzenich|date=April 25, 2013|accessdate=March 27, 2016}}</ref>
 
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. <ref>{{cite web|url=
 
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. <ref>{{cite web|url=
 
http://www.conwaylife.com/forums/viewtopic.php?f=2&t=1082&start=25#p7901|title=Re: Just the place for a Snark!|author=Dave Greene|date=June 8, 2013|accessdate=April 5, 2017}}</ref>
 
http://www.conwaylife.com/forums/viewtopic.php?f=2&t=1082&start=25#p7901|title=Re: Just the place for a Snark!|author=Dave Greene|date=June 8, 2013|accessdate=April 5, 2017}}</ref>
  
A coincidence: If the glider in the infobox is moved to the right by 2 cells, the south eater will act as a one-time reflector for the glider, which is then eaten by the west eater.
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[[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.]]
 
 
[[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.]]
 
  
 
== References ==
 
== References ==
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== External links ==
 
== External links ==
 
{{LinkLexicon|lex_s.htm#snark}}
 
{{LinkLexicon|lex_s.htm#snark}}
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{{LinkCatagolue|xs49_wc9b88gy9o8zg88mlldxooy3321z11074zy5c453|format=pseudo-object}}

Latest revision as of 00:35, 26 September 2019

Snark
14b2o$14bobo$16bo4b2o$12b4ob2o2bo2bo$12bo2bobobobob2o$15bobobobo$16b2o bobo$20bo2$6b2o$7bo7b2o$7bobo5b2o$8b2o7$18b2o$18bo$19b3o$21bo7$3o$2bo$ bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART ]] #C [[ WIDTH 600 HEIGHT 600 X 3 Y -3 THUMBSIZE 2 ZOOM 20 GPS 30 LOOP 128 ]]
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

The Snark is a 90° stable glider reflector discovered by Mike Playle on April 25, 2013.[1] It is made up of two eaters, 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 use a bouncer (periodic).

#C four Snark catalyst variants #C Top: original variant by Mike Playle #C Left: Shannon Omick (better clearance on a diagonal) #C Right: Heinrich Koenig (better clearance on a different diagonal) #C Bottom: Simon Ekström (better clearance on two diagonals) x = 51, y = 52, rule = B3/S23 20b2o$20bobo$22bo4b2o$18b4ob2o2bo2bo$18bo2bobobobob2o$21bobobobo$22b2o bobo$26bo2$12b2o$13bo7b2o$13bobo5b2o$14b2o25bo$39b3o$38bo$38b2o3$46b2o $24b2o21bo$24bo22bob2o$14b3o8b3o11b2o4b3o2bo$4bo11bo10bo11b2o3bo3b2o$ 2b5o8bo5b2o21b4o$bo5bo13bo8b2o15bo$bo2b3o12bobo7bobo12b3o$2obo15b2o8bo 13bo$o2b4o21b2o14b5o$b2o3bo3b2o11bo22bo2bo$3b3o4b2o11b3o22b2o$3bo22bo$ 2obo21b2o$2ob2o3$11b2o$12bo$9b3o$9bo25b2o$28b2o5bobo$28b2o7bo$37b2o2$ 24bo$23bobob2o4b2o$23bobobobo2bo2bo$22b2obobobo3b2o$23bo2b2ob4o$23bo4b o3bo$24b3obo2bo$26bobobo$29bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THEME 6 GRID GRIDMAJOR 0 ZOOM 8 HEIGHT 480 THUMBLAUNCH THUMBSIZE 2 ]]
four Snark catalyst variants --
Top:  original variant by Mike Playle
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 made oscillators of previously unknown periods of 43 and 53 trivial.[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 period 4 reflector with repeat time 52 was used for p52+4n glider streams before the Snark was discovered.

References

  1. Mike Playle (April 25, 2013). "Just the place for a Snark!". Retrieved on March 27, 2016.
  2. Adam P. Goucher (February 17, 2010). "Re: Incomplete search patterns - try to complete". Retrieved on May 8, 2013.
  3. Matthias Merzenich (April 25, 2013). "Re: Just the place for a Snark!". Retrieved on March 27, 2016.
  4. Dave Greene (June 8, 2013). "Re: Just the place for a Snark!". Retrieved on April 5, 2017.

External links