T-tetromino
| T-tetromino | |||||||||
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| Pattern type | Miscellaneous | ||||||||
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| Number of cells | 4 | ||||||||
| Bounding box | 3 × 2 | ||||||||
| Discovered by | John Conway | ||||||||
| Year of discovery | 1969 | ||||||||
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T-tetromino is one of the five tetrominoes. In Game of Life it is a common predecessor of the traffic light, and when paired with another T-tetromino it can become a pre-pulsar.
It is the one-tick descendant of the T-pentomino and a parent of bullet heptomino.
The T-tetromino can also be used as a still life component if the birth sites are blocked, however stabilisations of it tend to be quite large. The flat side can be suppressed via induction coils such as a bookend, and the two L-shaped regions can be stabilised similarly to an aircraft carrier.
In other rules
The T-tetromino exhibits interesting behaviour in other Life-like rules. It is a c/4 orthogonal spaceship in 32 totalistic rules, B345/S126 to B345678/S12678, with the tip of the T being the trailing edge; it is also a c/4 orthogonal spaceship in various isotropic non-totalistic rules, though it evolves differently.
In the non-totalistic rule tlife, the T-tetromino is an extremely common c/5 orthogonal spaceship, with the tip of the T being the leading edge.
In some non-totalistic rules like B3/S23-a6c, the T-tetromino evolves into a 5-cell c/2 orthogonal spaceship with a dot spark behind the tip.
External links
- T-tetromino at the Life Lexicon
- T-tetromino (rule b3s2-i34q) at Adam P. Goucher's Catagolue
- T-tetromino (rule b345s126) at Adam P. Goucher's Catagolue
- Glider 26 at David Eppstein's Glider Database