Difference between revisions of "B-heptomino"
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The '''B-heptomino''' (or B-heptaplet, if the top-left cell is shifted one cell left) 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. | The '''B-heptomino''' (or B-heptaplet, if the top-left cell is shifted one cell left) 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 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. Many conduits produce this form of B via the R-pentomino, so these two forms of B can be used interchangeably when marking in conduits. | ||
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]], | 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]], [[ecologist]], or [[pufferfish]]. | ||
== In other rules == | == In other rules == | ||
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==Image gallery== | ==Image gallery== | ||
<gallery> | <gallery> | ||
Image:BheptominoGen20.png|Generation 20 of the B-heptomino | Image:BheptominoGen20.png|Generation 20 of the B-heptomino, showing its [[Herschel]] offspring | ||
Image:BheptominoFinal.png|Generation 148 of the B-heptomino | Image:BheptominoFinal.png|Generation 148 of the B-heptomino | ||
Image:Bparent.png|A 6-cell parent of the B-heptomino | Image:Bparent.png|A 6-cell parent of the B-heptomino | ||
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==See also== | ==See also== | ||
*[[Herschel]] | |||
*[[C-heptomino]] | *[[C-heptomino]] | ||
*[[Conduit 1]] | *[[Conduit 1]] | ||
Revision as of 10:34, 7 October 2019
| B-heptomino | |||||||
| View static image | |||||||
| Pattern type | Methuselah | ||||||
|---|---|---|---|---|---|---|---|
| Number of cells | 7 | ||||||
| Bounding box | 4 × 3 | ||||||
| MCPS | 7 | ||||||
| Lifespan | 148 generations | ||||||
| Final population | 28 | ||||||
| L/I | 21.1 | ||||||
| F/I | 4 | ||||||
| F/L | 0.189 | ||||||
| L/MCPS | 21.1 | ||||||
| Discovered by | John Conway | ||||||
| Year of discovery | 1970 | ||||||
| |||||||
| |||||||
The B-heptomino (or B-heptaplet, if the top-left cell is shifted one cell left) 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. Many conduits produce this form of B via the R-pentomino, so these two forms of B can be used interchangeably when marking in conduits.
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, ecologist, or pufferfish.
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, showing its Herschel offspring
Generation 148 of the B-heptomino
A 6-cell parent of the B-heptomino
See also
External links
- B-heptomino at the Life Lexicon