Difference between revisions of "Period-24 glider gun"
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'''True period 24 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> | '''True period 24 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> | ||
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" /> The period 48 gun is shown below using the reduced variant form.<ref name="jslife" /> | 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" /> The period 48 gun is shown below using the reduced variant form.<ref name="jslife" /> A smaller p48 gun 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&sid=f4f6a10cc8b6e7902a977e422502bc24&start=1075#p32769}}</ref> | ||
==Image gallery== | ==Image gallery== |
Revision as of 16:37, 5 July 2016
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True period 24 gun | |||||
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Pattern type | Gun | ||||
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Number of cells | 335 | ||||
Bounding box | 43 × 32 | ||||
Period | 24 | ||||
Barrels | Unknown | ||||
Discovered by | Noam Elkies | ||||
Year of discovery | 1997 | ||||
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True period 24 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]
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] The period 48 gun is shown below using the reduced variant form.[2] A smaller p48 gun was found in 2016 by Tanner Jacobi, using Rich's p16 to double the period.[3]
Image gallery
See also
References
- ↑ 1.0 1.1 Paul Callahan (February 11, 2001). "p24 "true" gun (mail digest)". Retrieved on March 17, 2016.
- ↑ 2.0 2.1 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.