Difference between revisions of "P42 glider shuttle"
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|h = 56.1 | |h = 56.1 | ||
|v = 0.75 | |v = 0.75 |
Revision as of 14:42, 16 December 2018
p42 glider shuttle | |||||||
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Pattern type | Oscillator | ||||||
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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 | ||||||
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The p42 glider shuttle is a period 42 shuttle oscillator discovered by Noam Elkies in 1994. It was the first non-trivial 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 between 140 and 149 cells
- Periodic objects with minimum population between 140 and 149
- Patterns with between 140 and 149 cells
- Patterns found by Noam Elkies
- Patterns found in 1994
- Oscillators
- 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