Difference between revisions of "B-heptomino"
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The '''B-heptomino''' is a very common [[methuselah]] that evolves into three [[block]]s, two [[glider]]s and a [[ship]] after 148 generations. Compare with [[Herschel]], which appears at generation 20 of B-heptomino's evolution. | The '''B-heptomino''' is a very common [[methuselah]] that evolves into three [[block]]s, two [[glider]]s and a [[ship]] after 148 generations. Compare with [[Herschel]], which appears at generation 20 of the B-heptomino's evolution. B-heptominoes acquired particular importance in [[:Category:Patterns found in 1996|1996]] due to [[:Category:Patterns found by David Buckingham|David Buckingham]]'s work on [[B track]]s. | ||
This pattern often arises with the cell at top left shifted one space to the left, producing a seven-bit [[polyplet]] that shares the same eight-bit descendant but is not technically a heptomino at all. This alternate form is shown as the input for [[elementary]] [[converter]] patterns such as [[BFx59H]] and [[BRx46B]]. This is standard practice for elementary [[conduit]]s, since many of these conduits do in fact produce this alternate form as output. | |||
The B-heptomino is considered a failed [[puffer]] or failed [[spaceship]], since on its own it travels at c/2 for only a short time before being affected by its own trailing debris. However, it can be stabilized into a c/2 puffer or into a [[clean]] c/2 rake or spaceship. See, e.g., [[puffer 2]], [[backrake 2]], and [[ecologist]]. | |||
== In other rules == | == In other rules == | ||
Revision as of 13:47, 5 June 2018
| B-heptomino | |||||||
| View static image | |||||||
| Pattern type | Methuselah | ||||||
|---|---|---|---|---|---|---|---|
| Number of cells | 7 | ||||||
| Bounding box | 4 × 3 | ||||||
| MCPS | 7 | ||||||
| Lifespan | 148 generations | ||||||
| Final population | 26 | ||||||
| L/I | 21.1 | ||||||
| F/I | 3.7 | ||||||
| F/L | 0.176 | ||||||
| L/MCPS | 21.1 | ||||||
| Discovered by | John Conway | ||||||
| Year of discovery | 1970 | ||||||
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The B-heptomino is a very common methuselah that evolves into three blocks, two gliders and a ship after 148 generations. Compare with Herschel, which appears at generation 20 of the B-heptomino's evolution. B-heptominoes acquired particular importance in 1996 due to David Buckingham's work on B tracks.
This pattern often arises with the cell at top left shifted one space to the left, producing a seven-bit polyplet that shares the same eight-bit descendant but is not technically a heptomino at all. This alternate form is shown as the input for elementary converter patterns such as BFx59H and BRx46B. This is standard practice for elementary conduits, since many of these conduits do in fact produce this alternate form as output.
The B-heptomino is considered a failed puffer or failed spaceship, since on its own it travels at c/2 for only a short time before being affected by its own trailing debris. However, it can be stabilized into a c/2 puffer or into a clean c/2 rake or spaceship. See, e.g., puffer 2, backrake 2, and ecologist.
In other rules
The B-heptomino is a stable puffer in many rules.
- In B3/S23-e4e, it evolves into a (16,5)c/74 oblique spaceship.
- In B3/S23-a, it is a glide-symmetric 10c/20 spaceship.
- In B34ej5y6n/S23, it is an oblique quadratic replicator, one of only a few known.
- In B36n/S2-i36c7c, it evolves into a glide-symmetric 9c/70 diagonal spaceship.
Image gallery
Generation 20 of the B-heptomino
Generation 148 of the B-heptomino
A 6-cell parent of the B-heptomino
See also
External links
- B-heptomino at the Life Lexicon