Difference between revisions of "Fore and back"
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{{Oscillator | {{Oscillator | ||
|name | |name = Fore and back | ||
|pname | |pname = foreandback | ||
|f1 | |f1 = Billiard table | ||
|c | |c = 24 | ||
|bx | |bx = 7 | ||
|by | |by = 7 | ||
|p | |fc = 30.6 | ||
|m | |p = 2 | ||
|h | |m = 1 | ||
|v | |h = 4 | ||
|rotor = Pole 2 | |v = 0.15 | ||
|discoverer | |rotor = Pole 2 | ||
|discoveryear = 1994 | |discoverer = Achim Flammenkamp | ||
|rulemin | |discoveryear = 1994 | ||
|rulemax | |rulemin = B3/S23 | ||
|rulespecial | |rulemax = B3678/S02345678 | ||
| | |rulespecial = [[Conway's Game of Life|Conway Life]], [[HighLife]] | ||
| | |isorulemin = B3y/S2aen3anr | ||
| | |isorulemax = B1e2kn34-iry5-nr678/S01c2345678 | ||
| | |synthesis = 6 | ||
|plaintext | |synthesisRLE = true | ||
|rle | |plaintext = true | ||
|animated | |rle = true | ||
|viewerconfig = #C [[ GPS 2 THUMBSIZE 2 ]] | |animated = true | ||
|apgcode | |viewerconfig = #C [[ GPS 2 THUMBSIZE 2 ]] | ||
|apgcode = xp2_ca1n0brz330321 | |||
|pentadecathlonid = 24P2.142 | |||
}} | }} | ||
'''Fore and back''' (or '''complementary blinker''') is a [[period]] [[:Category:Oscillators with period 2|2]] [[oscillator]] that was found by [[:Category:Patterns found by Achim Flammenkamp|Achim Flammenkamp]] in July [[:Category:Patterns found in 1994|1994]]. Its [[rotor]] is the same as the [[blinker]]. | '''Fore and back''' (or '''complementary blinker''' | ||
<ref>{{CiteLexicon|file=lex_c.htm#complementaryblinker|name=Complementary blinker|accessdate=December 3, 2018}}</ref>) is a [[period]] [[:Category:Oscillators with period 2|2]] [[oscillator]] that was found by [[:Category:Patterns found by Achim Flammenkamp|Achim Flammenkamp]] in July [[:Category:Patterns found in 1994|1994]]. Its [[rotor]] is the same as the [[blinker]]. | |||
==[[List of common oscillators|Commonness]]== | ==[[List of common oscillators|Commonness]]== | ||
Fore and back is about the thirty-eighth most [[common]] naturally-occurring oscillator in [[Achim Flammenkamp's census]], being less common than [[boat on spark coil]] and [[griddle | Fore and back is about the thirty-eighth most [[common]] naturally-occurring oscillator in [[Achim Flammenkamp's census]], being less common than [[boat on spark coil]] and [[block on griddle]], about as common as [[21P2]], and more common than [[trans-block on long hook eating tub]] and [[trans-beacon down on long hook]].<ref>{{citeAchim|accessdate=January 15, 2009}}</ref> It is the most common oscillator that is generally agreed to be a [[billiard table]], though some instead give this title to the more common [[test tube baby]], which counts under a looser definition. | ||
==Synthesis== | ==Synthesis== | ||
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{{LinkLexicon|lex_f.htm#foreandback}} | {{LinkLexicon|lex_f.htm#foreandback}} | ||
{{LinkCatagolue|xp2_ca1n0brz330321}} | {{LinkCatagolue|xp2_ca1n0brz330321}} | ||
{{LinkPentadecathlonObject|24P2.142}} | |||
{{Symmetry|180degree|osc=flip}} | {{Symmetry|180degree|osc=flip}} | ||
__NOTOC__ | __NOTOC__ | ||
Revision as of 22:02, 3 July 2019
| Fore and back | |||||||||
| View animated image | |||||||||
| View static image | |||||||||
| Pattern type | Oscillator | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Oscillator type | Billiard table | ||||||||
| Number of cells | 24 | ||||||||
| Bounding box | 7 × 7 | ||||||||
| Frequency class | 30.6 | ||||||||
| Period | 2 | ||||||||
| Mod | 1 | ||||||||
| Heat | 4 | ||||||||
| Volatility | 0.15 | ||||||||
| Strict volatility | 0.15 | ||||||||
| Rotor type | Pole 2 | ||||||||
| Discovered by | Achim Flammenkamp | ||||||||
| Year of discovery | 1994 | ||||||||
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Fore and back (or complementary blinker [1]) is a period 2 oscillator that was found by Achim Flammenkamp in July 1994. Its rotor is the same as the blinker.
Commonness
Fore and back is about the thirty-eighth most common naturally-occurring oscillator in Achim Flammenkamp's census, being less common than boat on spark coil and block on griddle, about as common as 21P2, and more common than trans-block on long hook eating tub and trans-beacon down on long hook.[2] It is the most common oscillator that is generally agreed to be a billiard table, though some instead give this title to the more common test tube baby, which counts under a looser definition.
Synthesis
In August, 2013 a 24-glider synthesis of this oscillator was found by Martin Grant, based on a soup, provided by Lewis Patterson. Several days later Mark Niemiec improved this result, having found a 20-glider synthesis.[3]
In October 2014, Tanner Jacobi found a predecessor for this pattern based on a soup from Adam P. Goucher's apgsearch script, which was eventually optimized to a 6-glider synthesis[4] in November.
See also
References
- ↑ "Complementary blinker". The Life Lexicon. Stephen Silver. Retrieved on December 3, 2018.
- ↑ Achim Flammenkamp (September 7, 2004). "Most seen natural occurring ash objects in Game of Life". Retrieved on January 15, 2009.
- ↑ "Synthesising Oscillators". Retrieved on September 10, 2013.
- ↑ "Soup search results". Retrieved on November 9, 2014.
External links
- Fore and back at the Life Lexicon
- 24P2.142 at Heinrich Koenig's Game of Life Object Catalogs
Categories:
- Patterns
- Patterns with Catagolue frequency class 30
- Natural periodic objects
- Oscillators with 24 cells
- Periodic objects with minimum population 24
- Patterns with 24 cells
- Patterns found by Achim Flammenkamp
- Patterns found in 1994
- Patterns that can be constructed with 6 gliders
- Oscillators
- Billiard tables
- Oscillators with period 2
- Oscillators with mod 1
- Oscillators with heat 4
- Oscillators with volatility 0.15
- Oscillators with strict volatility 0.15
- Oscillators with rotor Pole 2
- Patterns with 180-degree rotation symmetry
- Flipping oscillators