Period-43 glider gun
| Period-43 glider gun | |||||||||
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| Pattern type | Gun | ||||||||
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| Number of cells | 66 | ||||||||
| Bounding box | 32 × 25 | ||||||||
| Period | 43 | ||||||||
| Barrels | 2 | ||||||||
| Discovered by | Nora Brown | ||||||||
| Year of discovery | 2022 | ||||||||
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A true period 43 glider gun was discovered by Nora Brown on September 11, 2022.[1] It uses the same honey farm + fishhook → glider reaction that many other glider guns do. It was originally found in a form using a block and eater instead of the shillelagh on wing, but the block got turned into a pond rather than actually being restored, so Bellman was used to complete it.
This is the only known engine-based true period-43 gun, and oscillators based on this gun were the only known period-43 oscillators that don't use the Snark before the discovery of the p43 pi-heptomino hassler in November 2022.[2] Prior to that, the 80-cell form of the gun capped with fishhooks was also the smallest known period-43 oscillator by population.
When the gun was discovered, it was tied for the seventh smallest by bounding box.
A 30-glider synthesis of the gun was found early the next day.[3]
In other rules
The specific honey farm predecessor triggered in the gun evolves differently under the isotropic transition B4c (as in 4diagonal, B34c/S23) to advance 2 generations faster, rephasing the gun to p41.[4]
| Depiction of the phase where the evolution of the honey farm predecessor differs between Life (B3/S23, left) and 4diagonal (B34c/S23, right). Advance the pattern 1 generation to see the difference between the honey farm predecessors. (click above to open LifeViewer) |
Due to this rephasing, the discovery of cribbage provided 4diagonal (B34c/S23) with proof of being omniperiodic one week before regular Life (B3/S23).[5]
References
- ↑ Nora Brown (September 11, 2022). Re: Gun Discussion Thread (discussion thread) at the ConwayLife.com forums
- ↑ Nora Brown (November 13, 2022). Re: Oscillator Discussion Thread (discussion thread) at the ConwayLife.com forums
- ↑ Carson Cheng (September 12, 2022). Re: Synthesising Oscillators (discussion thread) at the ConwayLife.com forums
- ↑ Period1GliderGun (January 17, 2023). Re: Oscillator Discussion Thread (1-transition) (discussion thread) at the ConwayLife.com forums
- ↑ Period1GliderGun (August 13, 2023). Re: Rules 1 transition from Life (discussion thread) at the ConwayLife.com forums