Difference between revisions of "Grin"
Jump to navigation
Jump to search
m ("Chesire" typo fix) |
m (... oops, there's another one) |
||
| Line 34: | Line 34: | ||
==External links== | ==External links== | ||
{{LinkLexicon|lex_g.htm#grin}} | {{LinkLexicon|lex_g.htm#grin}} | ||
{{LinkLexicon|filename=lex_c.htm#cheshirecat|patternname= | {{LinkLexicon|filename=lex_c.htm#cheshirecat|patternname=Cheshire cat}} | ||
{{LinkEppstein|195|patternname=Moon}} | {{LinkEppstein|195|patternname=Moon}} | ||
{{LinkCatagolue|xq1_69|rule=b2s|patternname=Moon}} | {{LinkCatagolue|xq1_69|rule=b2s|patternname=Moon}} | ||
{{Symmetry|orthogonal2}} | {{Symmetry|orthogonal2}} | ||
Revision as of 22:30, 17 June 2020
| Grin | |||||||
| View static image | |||||||
| Pattern type | Miscellaneous | ||||||
|---|---|---|---|---|---|---|---|
| Number of cells | 4 | ||||||
| Bounding box | 4 × 2 | ||||||
| Discovered by | Unknown | ||||||
| Year of discovery | 1970 | ||||||
| |||||||
| |||||||
Grin is a common parent of the block. Its name derives from the Cheshire cat, an 18-cell six-tick grin predecessor created by C. R. Tompkins that appeared unaccountably both in Scientific American and in Winning Ways.
| Cheshire cat, leaving a block as its pawprint (click above to open LifeViewer) RLE: here Plaintext: here |
In other rules
Moon moving
Grin is a common lightspeed spaceship in many Life-like cellular automata, for example Seeds and Live Free or Die. It is the third most common spaceship in the former, where it is known as moon. In isotropic non-totalistic cellular automata, it works from B2ae/S to B23-j45678/S01e2-k345678.
The pattern also appears as a c/2 orthogonal spaceship in some B0 rules,[which?] interestingly keeping the same appearance in all phases.
See also
External links
- Grin at the Life Lexicon
- Cheshire cat at the Life Lexicon
- Moon at David Eppstein's Glider Database
- Moon (rule b2s) at Adam P. Goucher's Catagolue