Pufferfish spaceship
A pufferfish spaceship (or puffership) is, generally, any spaceship constructed using pufferfish. The simplest would be to delete the puffed blocks with middleweight or heavyweight spaceships. The term may also refer specifically to the extensible c/2 period-36 spaceship constructed by Ivan Fomichev in December 2014[1], the first such spaceship to contain no period-2 or period-4 parts. (The first two or three rows might be considered to be period 2 or 4, but they are directly dependent on following rows for support.)
The pattern consists of two adjacent pufferfish puffers, plus four copies of a nontrivial period-36 c/2 fuse for pufferfish exhaust, discovered using a randomized soup search. Nico Brown found additional puffership spaceship variants two days later.[2]
Chris Cain found a 60-glider synthesis of an elongated pufferfish spaceship in February 2015.[3] More expensive syntheses of shorter pufferships were created by various Discord users in August 2020.[4][5][6] As of October 2020, the shortest and cheapest known puffership synthesis used 51 gliders and was found by Dave Greene.[7]
In February 2022, after the discovery of 35P12H6V0 that can support a similar block-laying tagalong, toroidalet found efficient mechanisms for constructing much shorter pufferfish spaceships,[8] though a workable construction method for the shortest possible puffership spaceship is still unknown.
References
- ↑ Ivan Fomichev (December 27, 2014). Pufferfish and companions (discussion thread) at the ConwayLife.com forums
- ↑ Nico Brown (December 29, 2014). Re: Pufferfish and companions (discussion thread) at the ConwayLife.com forums
- ↑ Chris Cain (February 5, 2015). Re: Small Spaceship Syntheses (discussion thread) at the ConwayLife.com forums
- ↑ Adam P. Goucher (August 10, 2020). Message in #cgol on the Conwaylife Lounge Discord server
- ↑ Dave Greene (August 10, 2020). Message in #cgol on the Conwaylife Lounge Discord server
- ↑ Goldtiger997 (August 11, 2020). Message in #cgol on the Conwaylife Lounge Discord server
- ↑ Dave Greene (October 12, 2020). Re: Small Spaceship Syntheses (discussion thread) at the ConwayLife.com forums
- ↑ toroidalet (February 12, 2022). Re: Small Spaceship Syntheses (discussion thread) at the ConwayLife.com forums
External links
- Pufferfish spaceship at the Life Lexicon
- Pufferfish spaceship (canonical version) at Adam P. Goucher's Catagolue (extended)
- Patterns
- Spaceships with between 200 and 299 cells
- Periodic objects with minimum population between 200 and 299
- Patterns with between 200 and 299 cells
- Patterns found by Ivan Fomichev
- Patterns found in 2014
- Patterns that can be constructed with between 50 and 59 gliders
- Outer-totalistically endemic patterns
- Isotropically endemic patterns
- Spaceships
- Spaceships with period 36
- Orthogonal spaceships
- Spaceships with speed c/2
- Spaceships with unsimplified speed 18c/36
- Spaceships with heat between 200 and 299
- Spaceships with mod 36
- Everything else
- Glossary
- Engineered spaceships