Difference between revisions of "Fore and back"
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{{Oscillator|p=2| | {{Oscillator | ||
'''Fore and back''' (or '''complementary blinker''') is a | |name = Fore and back | ||
|pname = foreandback | |||
|f1 = Billiard table | |||
|c = 24 | |||
|bx = 7 | |||
|by = 7 | |||
|fc = 30.6 | |||
|p = 2 | |||
|m = 1 | |||
|h = 4 | |||
|v = 0.15 | |||
|rotor = Pole 2 | |||
|discoverer = Achim Flammenkamp | |||
|discoveryear = 1994 | |||
|rulemin = B3/S23 | |||
|rulemax = B3678/S02345678 | |||
|rulespecial = [[Conway's Game of Life|Conway Life]], [[HighLife]] | |||
|isorulemin = B3y/S2aen3anr | |||
|isorulemax = B1e2kn34-iry5-nr678/S01c2345678 | |||
|synthesis = 6 | |||
|synthesisRLE = true | |||
|plaintext = true | |||
|rle = true | |||
|animated = true | |||
|viewerconfig = #C [[ GPS 2 THUMBSIZE 2 ]] | |||
|apgcode = xp2_ca1n0brz330321 | |||
|pentadecathlonid = 24P2.142 | |||
}} | |||
'''Fore and back''' (or '''complementary blinker'''<ref>{{CiteLexicon|file=lex_c.htm#complementaryblinker|name=Complementary blinker|accessdate=December 3, 2018}}</ref>) is a {{period|2}} [[oscillator]] that was found by [[Achim Flammenkamp]] in July {{year|1994}}. Its [[rotor]] is the same as the [[blinker]]. | |||
==[[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 [[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.<ref name="post78873" /> | |||
In August, | ==Synthesis== | ||
In August {{year|2013}}, a {{gliders|24}} [[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 {{gliders|20|brief}}-glider synthesis.<ref>{{cite web|url=http://www.conwaylife.com/forums/viewtopic.php?p=8688#p8688|title=Synthesising Oscillators|date=|accessdate=September 10, 2013}}</ref> | |||
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<ref>{{cite web|url=http://www.conwaylife.com/forums/viewtopic.php?f=2&t=1452&start=50#p14192|title=Soup search results|date=|accessdate=November 9, 2014}}</ref> in November. | In October {{year|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 {{gliders|6|brief}}-glider synthesis<ref>{{cite web|url=http://www.conwaylife.com/forums/viewtopic.php?f=2&t=1452&start=50#p14192|title=Soup search results|date=|accessdate=November 9, 2014}}</ref> in November. | ||
==See also== | ==See also== | ||
*[[Snake pit]] | *[[Snake pit]] | ||
==References== | ==References== | ||
<references /> | <references> | ||
<ref name="post78873">{{LinkForumThread | |||
|format = ref | |||
|title = Re: Thread for basic questions | |||
|p = 78873 | |||
|author = Dave Greene | |||
|date = July 3, 2019 | |||
}}</ref> | |||
</references> | |||
==External links== | ==External links== | ||
{{LinkLexicon|lex_f.htm#foreandback}} | {{LinkLexicon|lex_f.htm#foreandback}} | ||
{{LinkCatagolue|xp2_ca1n0brz330321}} | |||
{{LinkPentadecathlonObject|24P2.142}} | |||
{{Symmetry|180degree|osc=flip}} | {{Symmetry|180degree|osc=flip}} | ||
__NOTOC__ |
Revision as of 15:52, 8 September 2019
Fore and back | |||||||||
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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.[3]
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.[4]
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[5] 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.
- ↑ Dave Greene (July 3, 2019). Re: Thread for basic questions (discussion thread) at the ConwayLife.com forums
- ↑ "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
- 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