Pure glider generator: Difference between revisions
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{{Glossary}} | {{Glossary}} | ||
A '''pure glider generator''' (or simply '''glider generator''') is a [[pattern]] that evolves into one or more [[glider]]s and nothing else. They are part of the [[Cosmology|cosmological]] classification of Life patterns. There was interest in this scheme early on, and within it on pure glider generators in particular (they were reported on quite frequently in the early issues of [[Lifeline]], for example) | A '''pure glider generator''' (or simply '''glider generator''') is a [[pattern]] that evolves into one or more [[glider]]s and nothing else. They are part of the [[Cosmology|cosmological]] classification of Life patterns. There was interest in this scheme early on, and within it on pure glider generators in particular (they were reported on quite frequently in the early issues of [[Lifeline]], for example). | ||
==Examples== | ==Examples== | ||
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==External links== | ==External links== | ||
{{LinkLexicon|lex_p.htm#pureglidergenerator}} | * {{LinkLexicon|lex_p.htm#pureglidergenerator}} | ||
{{LinkLexicon|filename=lex_1.htm#a-4812diamond|patternname=4-8-12 diamond}} | * {{LinkLexicon|filename=lex_1.htm#a-4812diamond|patternname=4-8-12 diamond}} | ||
{{LinkLexicon|filename=lex_b.htm#biloaf|patternname=Bi-loaf}} | * {{LinkLexicon|filename=lex_b.htm#biloaf|patternname=Bi-loaf}} | ||
{{LinkLexicon|filename=lex_b.htm#biclock|patternname=Bi-clock}} | * {{LinkLexicon|filename=lex_b.htm#biclock|patternname=Bi-clock}} | ||
__NOTOC__ | __NOTOC__ | ||
Revision as of 07:02, 8 June 2022
A pure glider generator (or simply glider generator) is a pattern that evolves into one or more gliders and nothing else. They are part of the cosmological classification of Life patterns. There was interest in this scheme early on, and within it on pure glider generators in particular (they were reported on quite frequently in the early issues of Lifeline, for example).
Examples
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The 4-8-12 diamond and the bi-loaf[note 1] are two pure glider generators found by the Honeywell group in 1971.[1] The former evolves into four gliders (one heading in each diagonal direction) in 15 generations, while the latter yields two after four ticks. Gliders from the bi-loaf run in opposite ways along the diagonal that is closest to the great axis of the pattern. E.g. when the great axis is NNE-SSW, the gliders' directions are northeast & southwest. The bi-clock is a later example found by Dale Edwin Cole in the same year.[2] It consists of two closely placed clocks, and evolves into two gliders in two generations.
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Mirage (or Fata Morgana) is a pure glider generator in which many sparse cells quickly create 13 gliders. Eight of those gliders construct a Gosper glider gun at generation 34, but the remaining five destroy the gun by generation 73.[3] Similar patterns based on other glider syntheses can be constructed.[4]
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The two examples above from unknown source have been added to this LifeWiki article since 2009.
A pure glider generator was featured on Randall Munroe's webcomic xkcd as a tribute to John Conway, the inventor of Game of Life.[5]
See also
Notes
- ↑ The term "bi-loaf" is now a collective description of the still lifes consisting of two loaves, e.g. the half-bakery and the loaf back tie loaf.
References
- ↑ Robert Wainwright (March 1971). Lifeline, vol 1, page 3.
- ↑ Robert Wainwright (June 1971). Lifeline, vol 2, page 5.
- ↑ Alan Hensel's lifep.zip pattern collection.
- ↑ Bob Shemyakin (August 17, 2014). Re: Pure Glider Generators (discussion thread) at the ConwayLife.com forums
- ↑ Randall Munroe (April 13, 2020). "2293: RIP John Conway". Retrieved on December 18, 2020.
External links
- Pure glider generator at the Life Lexicon
- 4-8-12 diamond at the Life Lexicon
- Bi-loaf at the Life Lexicon
- Bi-clock at the Life Lexicon