Difference between revisions of "P42 glider shuttle"
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−  {{Oscillatorname=p42 glider shuttlepname=p42glidershuttle  +  {{Oscillator 
−  The '''p42 glider shuttle''' is a [[period]]  +  name = p42 glider shuttle 
+  pname = p42glidershuttle  
+  f1 = Shuttle  
+  c = 143  
+  bx = 32  
+  by = 32  
+  p = 42  
+  m = 21  
+  h = 56.1  
+  v = 0.75  
+  sv = 0.33  
+  discoverer = Noam Elkies  
+  discoveryear = 1994  
+  rulemin = B3/S23  
+  rulemax = B38/S23678  
+  rulespecial = [[Conway's Game of LifeConway Life]]  
+  isorulemin = B3y/S23ey  
+  isorulemax = B34ciyz5aceiq6en7e8/S234cejz5ery678  
+  plaintext = true  
+  rle = true  
+  animated = true  
+  apgcode = xp42_y58k8y6nfgzxgwo4iq226y033325210g8mwiozw121074w4a96y3g091gpzy1ssy9hj30ggzccc8ka52wow8276wj10c4gf0252zy244252w23y019l91zy21023  
+  viewerconfig = #C [[ GPS 6 ZOOM 8 LOOP 42 ]]  
+  }}  
+  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==  
{  {  
    
−  [[Image:p18glidershuttle.pngframedleftA p18 glider shuttle using a custom period  +  [[Image:p18glidershuttle.pngframedleftA p18 glider shuttle using a custom period 6 oscillator by Dean Hickerson<br/>{{JavaRLEp18glidershuttlebrief}}]] 
[[Image:p246glidershuttle.pngframedleftA related p246 oscillator discovered by Dean Hickerson<br/>{{JavaRLEp246glidershuttlebrief}}]]  [[Image:p246glidershuttle.pngframedleftA related p246 oscillator discovered by Dean Hickerson<br/>{{JavaRLEp246glidershuttlebrief}}]]  
}  }  
==See also==  ==See also==  
−  *[[  +  *[[p50 glider shuttle]] 
==References==  ==References==  
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== External links ==  == External links ==  
−  {{LinkCatagoluexp42_y58k8y6nfgzxgwo4iq226y033325210g8mwiozw121074w4a96y3g091gpzy1ssy9hj30ggzccc8ka52wow8276wj10c4gf0252zy244252w23y019l91zy21023}}  +  {{LinkCatagoluexp42_y58k8y6nfgzxgwo4iq226y033325210g8mwiozw121074w4a96y3g091gpzy1ssy9hj30ggzccc8ka52wow8276wj10c4gf0252zy244252w23y019l91zy21023patternname=p42 glider shuttle}} 
{{Symmetrydiagonal2osc=flip}}  {{Symmetrydiagonal2osc=flip}}  
−  
−  
{{DISPLAYTITLE:p42 glider shuttle}}  {{DISPLAYTITLE:p42 glider shuttle}} 
Revision as of 18:10, 7 July 2019
p42 glider shuttle  
View animated image  
View static image  
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