Period-45 glider gun

Period-45 glider gun is a true period 45 glider gun discovered by Matthias Merzenich on April 29, 2010.[1][2] Its core is part of an agar with 90-degree rotational symmetry that produces pi-heptominoes. One of the hassling pentadecathlons extracts the output glider with its v spark, and the remaining three (in the original one-barrelled version below) suppress the pies with their domino spark.

Period-45 glider gun
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Pattern type Gun
Number of cells 147
Bounding box 47×38
Period 45
Barrels 4
Discovered by Matthias Merzenich
Year of discovery 2010

Soon after its discovery, Adam P. Goucher and Dave Greene reduced the bounding box with another pi-suppressing mechanism at the cost of higher population. In the infobox is a further improvement by Tanner Jacobi in 2015 with stable pi eaters found by bellman.[3]

Glider syntheses for the one-barrelled and four-barrelled versions of the original gun (costing 46 and 40 gliders respectively) were posted by Jeremy Tan on January 5, 2020, in response to a less efficient synthesis by Entity Valkyrie using a different method.[4]

Original period 45 glider gun

References
  1. Matthias Merzenich (April 29, 2010). Re: Pattern of the Year 2010 competition (discussion thread) at the ConwayLife.com forums
  2. H. Koenig (April 29, 2010). "New Period 45 Glider Gun". Game of Life News. Retrieved on May 29, 2020.
  3. Tanner Jacobi (April 12, 2015). Re: Execution of Old Guns by Variable-Speed Firing Squad (discussion thread) at the ConwayLife.com forums
  4. Jeremy Tan (January 5, 2020). Re: Synthesising Oscillators (discussion thread) at the ConwayLife.com forums
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