Difference between revisions of "P42 glider shuttle"
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|name = p42 glider shuttle | |name = p42 glider shuttle | ||
|pname = p42glidershuttle | |pname = p42glidershuttle | ||
|f1 = | |f1 = Relay | ||
|c = 143 | |c = 143 | ||
|bx = 32 | |bx = 32 | ||
|by = 32 | |by = 32 | ||
|p = 42 | |p = 42 | ||
|m = 21 | |||
|h = 56.1 | |h = 56.1 | ||
|v = 0.75 | |v = 0.75 | ||
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|rulemax = B38/S23678 | |rulemax = B38/S23678 | ||
|rulespecial = [[Conway's Game of Life|Conway Life]] | |rulespecial = [[Conway's Game of Life|Conway Life]] | ||
| | |isorulemin = B3-y/S23-ey | ||
| | |isorulemax = B34ciyz5aceiq6-en7e8/S234cejz5ery678 | ||
|plaintext = true | |plaintext = true | ||
|rle = true | |rle = true | ||
|animated = true | |animated = true | ||
|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 nontrivial period-42 oscillator, such as {{LinkCatagolue|xp42_gjjz1167w33w8e1ug8ozy0gw8o6kl3z0255lc321011zy011|patternname=unix on 44P7.2|style=raw}}, could have been constructed from two oscillators of lower period (such as p6 and p7), both of which were known by an earlier date. However, no such [[LCM oscillator]]s were attested prior to the discovery of this oscillator in 1994.}} and is based on a [https://conwaylife.com/patterns/p66.rle period 66 oscillator] discovered by [[Robert Wainwright]] in September {{year|1984}}. It consists of 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. | ||
== | ==Gallery== | ||
{| | {|style="margin:auto;width:300px;" | ||
|- | |- | ||
| | |{{EmbedViewer | ||
|[[ | |pname = p18glidershuttle | ||
|position = center | |||
|viewerconfig = #C [[ THUMBSIZE 2 GPS 6 ZOOM 8 AUTOSTART HEIGHT 500 ]] | |||
|caption = A p18 glider shuttle using a custom period 6 oscillator by Dean Hickerson | |||
}} | |||
|- | |||
|{{EmbedViewer | |||
|pname = p246glidershuttle | |||
|position = center | |||
|viewerconfig = #C [[ THUMBSIZE 2 GPS 6 ZOOM 8 AUTOSTART HEIGHT 500 ]] | |||
|caption = A related p246 oscillator discovered by Dean Hickerson | |||
}} | |||
|} | |} | ||
==See also== | ==See also== | ||
*[[ | * [[p50 glider shuttle]] | ||
==Notes== | |||
<references group="note" /> | |||
==References== | ==References== | ||
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== External links == | == External links == | ||
{{LinkCatagolue|xp42_y58k8y6nfgzxgwo4iq226y033325210g8mwiozw121074w4a96y3g091gpzy1ssy9hj30ggzccc8ka52wow8276wj10c4gf0252zy244252w23y019l91zy21023}} | * {{LinkCatagolue|xp42_y58k8y6nfgzxgwo4iq226y033325210g8mwiozw121074w4a96y3g091gpzy1ssy9hj30ggzccc8ka52wow8276wj10c4gf0252zy244252w23y019l91zy21023|patternname=p42 glider shuttle}} | ||
{{Symmetry|diagonal2|osc=flip}} | {{Symmetry|diagonal2|osc=flip}} | ||
{{DISPLAYTITLE:p42 glider shuttle}} | {{DISPLAYTITLE:p42 glider shuttle}} | ||
__NOTOC__ |
Latest revision as of 18:04, 5 November 2022
p42 glider shuttle | |||||||||
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Pattern type | Oscillator | ||||||||
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Oscillator type | Relay | ||||||||
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 consists of 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.
Gallery
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See also
Notes
- ↑ A nontrivial period-42 oscillator, such as unix on 44P7.2, could have been constructed from two oscillators of lower period (such as p6 and p7), both of which were known by an earlier date. However, no such LCM oscillators were attested prior to the discovery of this oscillator in 1994.
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
- Relays
- 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