Difference between revisions of "P42 glider shuttle"
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|apgcode = xp42_y58k8y6nfgzxgwo4iq226y033325210g8mwiozw121074w4a96y3g091gpzy1ssy9hj30ggzccc8ka52wow8276wj10c4gf0252zy244252w23y019l91zy21023 | |apgcode = xp42_y58k8y6nfgzxgwo4iq226y033325210g8mwiozw121074w4a96y3g091gpzy1ssy9hj30ggzccc8ka52wow8276wj10c4gf0252zy244252w23y019l91zy21023 | ||
|viewerconfig = #C [[ GPS 6 ZOOM 8 LOOP 42 ]] | |||
}} | }} | ||
The '''p42 glider shuttle''' is a | The '''p42 glider shuttle''' is a {{period|42}} [[shuttle]] [[oscillator]] discovered by [[Noam Elkies]] in {{year|1994}}. It was the first non-trivial period 42 oscillator to be discovered<ref>{{CiteHickersonOscillators|accessdate=July 8, 2010}}</ref>{{refn|group=note|A period-42 oscillator, {{LinkCatagolue|xp42_gjjz1167w33w8e1ug8ozy0gw8o6kl3z0255lc321011zy011|patternname=unix on 44P7.2|style=raw}}, can be constructed from two [[sparker]]s ([[unix]] and [[44P7.2]]) both of which were known by {{year|1977}}. However, this type of oscillator is generally considered "boring", and thus not counted despite technically being [[non-trivial]].}} and is based on a [http://www.conwaylife.com/patterns/p66.rle period 66 oscillator] discovered by [[Robert Wainwright]] in September {{year|1984}}. 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 {{year|1992}} 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== | ||
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==See also== | ==See also== | ||
*[[p50 glider shuttle]] | *[[p50 glider shuttle]] | ||
==Notes== | |||
<references group="note" /> | |||
==References== | ==References== | ||
Revision as of 00:18, 14 January 2020
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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 | ||||||||
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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][note 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
Notes
- ↑ A period-42 oscillator, unix on 44P7.2, can be constructed from two sparkers (unix and 44P7.2) both of which were known by 1977. However, this type of oscillator is generally considered "boring", and thus not counted despite technically being non-trivial.
References
- ↑ Dean Hickerson's oscillator stamp collection. Retrieved on July 8, 2010.
External links
Categories:
- 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