Difference between revisions of "P42 glider shuttle"
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apgcode = xp42_y58k8y6nfgzxgwo4iq226y033325210g8mwiozw121074w4a96y3g091gpzy1ssy9hj30ggzccc8ka52wow8276wj10c4gf0252zy244252w23y019l91zy21023  apgcode = xp42_y58k8y6nfgzxgwo4iq226y033325210g8mwiozw121074w4a96y3g091gpzy1ssy9hj30ggzccc8ka52wow8276wj10c4gf0252zy244252w23y019l91zy21023  
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−  The '''p42 glider shuttle''' is a [[period]] [[:Category:oscillators with period 4242]] [[shuttle]] [[oscillator]] discovered by [[Noam Elkies]] in [[:Category:patterns found in 19941994]]. It was the first nontrivial period 42 oscillator to be discovered<ref>{{CiteHickersonOscillatorsaccessdate=July 8, 2010}}</ref> and is based on a [http://www.conwaylife.com/  +  The '''p42 glider shuttle''' is a [[period]] [[:Category:oscillators with period 4242]] [[shuttle]] [[oscillator]] discovered by [[Noam Elkies]] in [[:Category:patterns found in 19941994]]. It was the first nontrivial period 42 oscillator to be discovered<ref>{{CiteHickersonOscillatorsaccessdate=July 8, 2010}}</ref> and is based on a [http://www.conwaylife.com/patterns/p66.rle period 66 oscillator] discovered by [[Robert Wainwright]] in September [[:category:patterns found in 19841984]]. It works by using two copies of [[eater 3]] and four copies of [[unix]] to shuttle two [[glider]]s back and forth. By increasing the distance between the two reflectors, oscillators of periods 42 + 24n can be created. [[Dean Hickerson]] found that the distance between the reflectors could be decreased using a custom period 6 oscillator to create a period 18 glider shuttle. In April [[:Category:patterns found in 19921992]] Hickerson created another related oscillator by crossing two pairs of gliders using [[rephaser]]s, which allowed the construction of oscillators of periods 246 + 24n. 
==Image gallery==  ==Image gallery== 
Revision as of 21:52, 29 April 2019
p42 glider shuttle  
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Pattern type  Oscillator  

Oscillator type  Shuttle  
Number of cells  143  
Bounding box  32×32  
Period  42  
Mod  21  
Heat  56.1  
Volatility  0.75  
Strict volatility  0.33  
Discovered by  Noam Elkies  
Year of discovery  1994  
 
 

The p42 glider shuttle is a period 42 shuttle oscillator discovered by Noam Elkies in 1994. It was the first nontrivial period 42 oscillator to be discovered^{[1]} and is based on a period 66 oscillator discovered by Robert Wainwright in September 1984. It works by using two copies of eater 3 and four copies of unix to shuttle two gliders back and forth. By increasing the distance between the two reflectors, oscillators of periods 42 + 24n can be created. Dean Hickerson found that the distance between the reflectors could be decreased using a custom period 6 oscillator to create a period 18 glider shuttle. In April 1992 Hickerson created another related oscillator by crossing two pairs of gliders using rephasers, which allowed the construction of oscillators of periods 246 + 24n.
Image gallery
See also
References
 ↑ Dean Hickerson's oscillator stamp collection. Retrieved on July 8, 2010.
External links
 Patterns
 Oscillators with 143 cells
 Patterns with 143 cells
 Patterns found by Noam Elkies
 Patterns found in 1994
 Oscillators
 Periodic objects with minimum population 143
 Shuttles
 Oscillators with period 42
 Oscillators with mod 21
 Oscillators with heat 56
 Oscillators with volatility 0.75
 Oscillators with strict volatility 0.33
 Patterns with bilateral diagonal symmetry
 Flipping oscillators