Difference between revisions of "Pre-pulsar spaceship"
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Revision as of 13:56, 8 March 2019
| Pre-pulsar spaceship | |||||||||||
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| Pattern type | Spaceship | ||||||||||
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| Number of cells | 128 | ||||||||||
| Bounding box | 73×14 | ||||||||||
| Direction | Orthogonal | ||||||||||
| Period | 30 | ||||||||||
| Mod | 30 | ||||||||||
| Speed | c/5 | ||||||||||
| Speed (unsimplified) | 6c/30 | ||||||||||
| Heat | 131.5 | ||||||||||
| Discovered by | David Bell | ||||||||||
| Year of discovery | 1998 | ||||||||||
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Pre-pulsar spaceship (or PPS for short) is any of three different period 30 c/5 orthogonal spaceships in which a pre-pulsar is pushed by a pair of spiders. The back sparks of these spaceships can be used to perturb gliders in many different ways, allowing the easy construction of c/5 puffers.
The first pre-pulsar spaceship, the symmetric pre-pulsar spaceship (or SPPS for short, shown to the right) was found by David Bell in May 1998 and was based on the P15 pre-pulsar spaceship found by Noam Elkies in December 1997.
The asymmetric pre-pulsar spaceship (or APPS for short, shown below) was found by Alan Hensel, also in May 1998, based on a skewed version of the pre-pulsar.
The third period 30 pre-pulsar spaceship, shown below, is similar to the symmetric pre-pulsar spaceship but contains an extra T-tetromino between the spiders and is glide symmetric.
Martin Grant's 601-glider spider synthesis resulted in a 1212-glider synthesis for the symmetric pre-pulsar spaceship on March 8, 2019.[1]
Image gallery
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References
- ↑ Adam P. Goucher (March 8, 2019). Re: Small Spaceship Syntheses (discussion thread) at the ConwayLife.com forums
External links
- Pre-pulsar spaceship at the Life Lexicon
- 128P30H6V0.1 at Heinrich Koenig's Game of Life Object Catalogs
- Patterns
- Patterns with 128 cells
- Patterns found by David Bell
- Patterns found in 1998
- Patterns that can be constructed with 101 or more gliders
- Spaceships
- Periodic objects with minimum population 128
- Spaceships with period 30
- Orthogonal spaceships
- Spaceships with speed c/5
- Spaceships with unsimplified speed 6c/30
- Spaceships with heat 131
- Spaceships with mod 30
- Patterns with bilateral orthogonal symmetry
- Patterns found by Alan Hensel
- Non-monotonic spaceships
- Patterns that can be constructed with 1212 gliders
