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Gosper Glider Gun 10-bit synthesis?

Posted: May 15th, 2017, 6:46 pm
by NewbTopolis Rex
At some point, I remember hearing that the smallest construction of a Gosper glider gun was 10 bits, and looked somewhat like this. However, I'm not sure what it was exactly. I may have found it on a wiki or something, but it's not there anymore.
It'd be awesome if someone told me what it was.
x = 8, y = 5, rule = Life
6bo$4bob2o$4bobo$2bobo$obo!

Re: Gosper Glider Gun 10-bit synthesis?

Posted: May 15th, 2017, 8:23 pm
by dvgrn
NewbTopolis Rex wrote:At some point, I remember hearing that the smallest construction of a Gosper glider gun was 10 bits, and looked somewhat like this...
It looks like what you're looking for is one of the early 10-cell infinite growth patterns:

Code: Select all

#N 10-cell infinite growth
#O Paul Callahan
#C A 10-cell infinite growth pattern found in 1997. No pattern with
#C fewer cells can exhibit infinite growth.
#C www.conwaylife.com/wiki/index.php?title=Infinite_growth
x = 8, y = 6, rule = 23/3
6bob$4bob2o$4bobob$4bo3b$2bo5b$obo!
The infinite growth record holders all produce switch-engine variants, not streams of gliders. It's not likely that any 10-cell pattern is a predecessor of a Gosper glider gun (or Simkin glider gun) -- though I think this has only been definitely ruled out for 9 cells or less.

Re: Gosper Glider Gun 10-bit synthesis?

Posted: May 22nd, 2017, 10:39 pm
by Kiran
dvgrn wrote:The infinite growth record holders all produce switch-engine variants, not streams of gliders
Except when the switch engine does create a stream of gliders:

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x = 162, y = 146, rule = B3/S23
160bo$159bo$159b3o141$bo$3o$2bo!