Ship+fishhook
| Ship+fishhook | |||||||||
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| Pattern type | Quasi still life | ||||||||
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| Number of cells | 13 | ||||||||
| Bounding box | 7 × 8 | ||||||||
| Static symmetry | Unspecified | ||||||||
| Discovered by | Brice Due | ||||||||
| Year of discovery | 2006 | ||||||||
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Ship+fishhook (also called equivalent names such as fishhook+ship or ship+eater) is a catalyst used in many oscillators and conduits. It was found by Brice Due in August 2006.[1]
Uses
The catalyst is used with a one-cell leading edge whenever a ship turns into a loaf when hit. If it turns into an I-heptomino relative instead, an R49 catalyst can be used instead.
| 72P21, an example of the catalyst being used (click above to open LifeViewer) RLE: here Plaintext: here |
| The catalyst being used in HL98B, with the eater bridged onto a tub with tail, a component of the eater 5. (click above to open LifeViewer) |
| The catalyst being used in a period-doubling stabilisation of ([p143 Bandersnatch loop (click above to open LifeViewer) Catagolue: here |
A ship+fishhook catalyst can also be combined with an elevener to form a different catalyst, used in 70P26 and 94P53.
| 70P26, an example of the ship+fishhook+elevener catalyst being used (click above to open LifeViewer) RLE: here Plaintext: here |
An alternate version of the catalyst can be used if clearance is an issue:
| alternate catalyst (click above to open LifeViewer) |
Occurrence
From statistics, as a very rough estimate, its occurrence should be about 20,000 times rarer than the fishhook itself, which is the frequency of a loaf appearing in a specific position (10,000) in two of four possible rotations (×2), as a loaf placed correctly will be converted to a ship, and loaves are much more common than non-Herschel ships. This puts it about on par with quadpole tie ship.
It does not appear in x2xb3s23clustersv0/C1/xs51, which evaluates the frequency of quasi still lifes and some farther apart, which is expected, as ship+fishhook would have frequency class 25, and figure eight (23) and mold (24) appear only once each.
Construction
The ship+fishhook constellation can be constructed by colliding four gliders, where two gliders collide to form the eater 1 which then catalyses the collision of the other two gliders:[2]
| A 4G synthesis[2] (click above to open LifeViewer) |
See also
- Eater bridge eater, used for a different one-cell leading edge
References
- ↑ Dave Greene (February 7, 2015). Re: The Hunting of the New Herschel Conduits (discussion thread) at the ConwayLife.com forums
- ↑ 2.0 2.1 shinjuku (#4116472097) (April 14, 2023). Job triggered by Adam P. Goucher at GitLab Catagolue project.