Difference between revisions of "Period-24 glider gun"
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{{ | {{Gun | ||
|name = Period-24 glider gun | |||
''' | |pname = trueperiod24gun | ||
|c = 335 | |||
|bx = 43 | |||
|by = 32 | |||
|p = 24 | |||
|b = 1 | |||
|discoverer = Noam Elkies | |||
|discoveryear = 1997 | |||
|plaintext = 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 [[Noam Elkies|Noam D. Elkies]] in [[:Category:Patterns found in 1997|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]] [[:Category:oscillators with period 4|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 name="jslife">{{cite web|url=http://entropymine.com/jason/life/|title=Pattern Collections, jslife/osc |author=Jason Summers|date=December 30, 2012|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" /> | 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== | |||
{| | {| | ||
|- | |- | ||
|[[Image:Period24glidergun(original).png|framed|left|Original period 24 glider gun.]] | |[[Image:Period24glidergun(original).png|framed|left|Original period 24 glider gun.]] | ||
|[[Image: | |[[Image:P48-gun-smaller.png|framed|left|Period 48 glider gun.]] | ||
|- | |||
| | |||
{{EmbedViewer | |||
|viewerconfig = #C [[ GPS 24 LOOP 48 THUMBLAUNCH THUMBSIZE 2 THEME 6 ZOOM 4 HEIGHT 480 ]] | |||
|pname = p24lwss | |||
|caption = A p24 [[LWSS]] gun, used in [[broken lines]].<br> | |||
|position = left | |||
}} | |||
| | |||
{{EmbedViewer | |||
|viewerconfig = #C [[ AUTOSTART GPS 24 LOOP 48 THUMBLAUNCH THUMBSIZE 2 THEME 6 ZOOM 12 HEIGHT 372 ]] | |||
|pname = duelingbanjosp24gun | |||
|caption = A smaller p24 gun based on [[dueling banjos]].<br> | |||
|position = left | |||
}} | |||
| | |||
{{EmbedViewer | |||
|viewerconfig = #C [[ AUTOSTART GPS 12 LOOP 48 THUMBLAUNCH THUMBSIZE 2 THEME 6 ZOOM 6 WIDTH 480 HEIGHT 480 ]] | |||
|pname = p48lwss | |||
|position = left | |||
|caption = A p48 [[LWSS]] gun, using [[Rich's p16]] and [[44P12.3]].<br> | |||
}} | |||
|} | |} | ||
==See also== | ==See also== | ||
*[[Period-20 glider gun]] | |||
[[Period-20 glider gun]] | |||
==References== | ==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== | |||
{{LinkLexicon|lex_p.htm#p24gun}} |
Revision as of 16:01, 10 November 2019
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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|
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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 (December 30, 2012). "Pattern Collections, jslife/osc". 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