Difference between revisions of "Period-24 glider gun"
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{{Gun | {{Gun | ||
|name = | |name = Period-24 glider gun | ||
|pname = trueperiod24gun | |pname = trueperiod24gun | ||
|c = 335 | |c = 335 | ||
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|discoverer = Noam Elkies | |discoverer = Noam Elkies | ||
|discoveryear = 1997 | |discoveryear = 1997 | ||
|plaintext = true | |||
|rle = true | |rle = true | ||
|viewerconfig = #C [[ ZOOM 8 AUTOSTART OFF ]] | |||
}} | }} | ||
'''Period-24 glider gun''' is a [[Gun#True-period_guns|true period]] 24 [[gun]] discovered by [[ | '''Period-24 glider gun''' is a [[Gun#True-period_guns|true period]] 24 [[gun]] discovered by [[Noam D. Elkies]] in {{year|1997}}.<ref name="callahan">{{cite web|url=http://www.radicaleye.com/lifepage/patterns/p24gun/p24gun.html|title=p24 "true" gun (mail digest)|author=Paul Callahan|date=February 11, 2001|accessdate=March 17, 2016}}</ref> It uses four large {{period|4}} [[oscillator]]s (two of them variants of [[fountain]], the other two adjoined by common [[casing]]) to hassle two [[T-tetromino]]s, which react together to produce gliders. The form on the right is a reduced variant found by Karel Suhajda.<ref>{{CiteSummersPattern|name=jslife|accessdate=March 17, 2016}}</ref> The eater 1 can be replaced with a [[unix]] for compacting purposes, such as in earlier versions of the [[period-48 glider gun]]. | ||
No more than five days after the initial discovery, Elkies found a method to double the period of the gun, resulting in the first known period 48 glider gun.<ref name="callahan" /> A smaller version was found in 2016 by Tanner Jacobi, using [[Rich's p16]] to double the period.<ref name="jacobi">{{cite web|title=Re: Soup search results|author=Tanner Jacobi|date=2016-07-05|accessdate=2016-07-05|work=ConwayLife.com forums|url=http://www.conwaylife.com/forums/viewtopic.php?f=2&t=1452&start=1075#p32769}}</ref> | No more than five days after the initial discovery, Elkies found a method to double the period of the gun, resulting in the first known period 48 glider gun.<ref name="callahan" /> A smaller version was found in 2016 by Tanner Jacobi, using [[Rich's p16]] to double the period.<ref name="jacobi">{{cite web|title=Re: Soup search results|author=Tanner Jacobi|date=2016-07-05|accessdate=2016-07-05|work=ConwayLife.com forums|url=http://www.conwaylife.com/forums/viewtopic.php?f=2&t=1452&start=1075#p32769}}</ref> | ||
In January {{year|2019}} a smaller period-24 gun was assembled by [[Tanner Jacobi]] and [[Matthias Merzenich]], based on the [[dueling banjos]] oscillator<ref name="post67805" /> (see animation below). It was further reduced in November of that same year due to the discovery of a new p6 [[domino]] [[sparker]] by [[Dongook Lee]].<ref name="post85150" /> Both of these variants have been used to create period-48 [[LWSS]] guns,<ref name="post67916" /><ref name="post85162" /> and the former gun was in turn used to create a [[pseudo-period]] 16 glider gun.<ref name="post67942" /> | |||
==Gallery== | ==Gallery== | ||
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{{EmbedViewer | {{EmbedViewer | ||
|viewerconfig = #C [[ GPS 24 LOOP 48 THUMBLAUNCH THUMBSIZE 2 THEME 6 ZOOM 4 HEIGHT 480 ]] | |viewerconfig = #C [[ GPS 24 LOOP 48 THUMBLAUNCH THUMBSIZE 2 THEME 6 ZOOM 4 HEIGHT 480 ]] | ||
|pname = | |pname = p24lwss | ||
|caption = A p24 [[LWSS]] gun, used in [[broken lines]].<br> | |caption = A p24 [[LWSS]] gun, used in [[broken lines]].<br> | ||
|position = left | |position = left | ||
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|pname = p48lwss | |pname = p48lwss | ||
|position = left | |position = left | ||
|caption = A p48 [[LWSS]] gun, using [[Rich's p16]].<br> | |caption = A p48 [[LWSS]] gun, using [[Rich's p16]] and [[44P12.3]].<br> | ||
}} | }} | ||
|} | |} | ||
==See also== | ==See also== | ||
*[[Period-20 glider gun]] | |||
==References== | |||
<references> | |||
<ref name="post67805">{{LinkForumThread | |||
|format = ref | |||
|title = Re: Execution of Old Guns by Variable-Speed Firing Squad | |||
|p = 67805 | |||
|author = Matthias Merzenich | |||
|date = January 13, 2019 | |||
}}</ref> | |||
<ref name="post85150">{{LinkForumThread | |||
|format = ref | |||
|title = Re: Oscillator Discussion Thread | |||
|p = 85150 | |||
|author = Matthias Merzenich | |||
|date = November 10, 2019 | |||
}}</ref> | |||
<ref name="post67916">{{LinkForumThread | |||
|format = ref | |||
|title = Re: Execution of Old Guns by Variable-Speed Firing Squad | |||
|p = 67916 | |||
|author = Matthias Merzenich | |||
|date = January 14, 2019 | |||
}}</ref> | |||
<ref name="post85162">{{LinkForumThread | |||
|format = ref | |||
|title = Re: Oscillator Discussion Thread | |||
|p = 85162 | |||
|author = BlinkerSpawn | |||
|date = November 10, 2019 | |||
}}</ref> | |||
<ref name="post67942">{{LinkForumThread | |||
|format = ref | |||
|title = Re: Execution of Old Guns by Variable-Speed Firing Squad | |||
|p = 67942 | |||
|author = Chris Cain | |||
|date = January 15, 2019 | |||
}}</ref> | |||
</references> | |||
==External links== | ==External links== | ||
{{LinkLexicon|lex_p.htm#p24gun}} | {{LinkLexicon|lex_p.htm#p24gun}} | ||
Revision as of 22:18, 6 March 2020
Period-24 glider gun | |||||||
View static image | |||||||
Pattern type | Gun | ||||||
---|---|---|---|---|---|---|---|
Number of cells | 335 | ||||||
Bounding box | 43 × 32 | ||||||
Period | 24 | ||||||
Barrels | 1 | ||||||
Discovered by | Noam Elkies | ||||||
Year of discovery | 1997 | ||||||
|
Period-24 glider gun is a true period 24 gun discovered by Noam D. Elkies in 1997.[1] It uses four large period-4 oscillators (two of them variants of fountain, the other two adjoined by common casing) to hassle two T-tetrominos, which react together to produce gliders. The form on the right is a reduced variant found by Karel Suhajda.[2] The eater 1 can be replaced with a unix for compacting purposes, such as in earlier versions of the period-48 glider gun.
No more than five days after the initial discovery, Elkies found a method to double the period of the gun, resulting in the first known period 48 glider gun.[1] A smaller version was found in 2016 by Tanner Jacobi, using Rich's p16 to double the period.[3]
In January 2019 a smaller period-24 gun was assembled by Tanner Jacobi and Matthias Merzenich, based on the dueling banjos oscillator[4] (see animation below). It was further reduced in November of that same year due to the discovery of a new p6 domino sparker by Dongook Lee.[5] Both of these variants have been used to create period-48 LWSS guns,[6][7] and the former gun was in turn used to create a pseudo-period 16 glider gun.[8]
Gallery
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See also
References
- ↑ 1.0 1.1 Paul Callahan (February 11, 2001). "p24 "true" gun (mail digest)". Retrieved on March 17, 2016.
- ↑ Jason Summers' jslife pattern collection. Retrieved on March 17, 2016.
- ↑ Tanner Jacobi (2016-07-05). "Re: Soup search results". ConwayLife.com forums. Retrieved on 2016-07-05.
- ↑ Matthias Merzenich (January 13, 2019). Re: Execution of Old Guns by Variable-Speed Firing Squad (discussion thread) at the ConwayLife.com forums
- ↑ Matthias Merzenich (November 10, 2019). Re: Oscillator Discussion Thread (discussion thread) at the ConwayLife.com forums
- ↑ Matthias Merzenich (January 14, 2019). Re: Execution of Old Guns by Variable-Speed Firing Squad (discussion thread) at the ConwayLife.com forums
- ↑ BlinkerSpawn (November 10, 2019). Re: Oscillator Discussion Thread (discussion thread) at the ConwayLife.com forums
- ↑ Chris Cain (January 15, 2019). Re: Execution of Old Guns by Variable-Speed Firing Squad (discussion thread) at the ConwayLife.com forums
External links
- Period-24 glider gun at the Life Lexicon