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|Number of cells||42|
|Discovered by||Robert Wainwright|
|Year of discovery||1984|
Jolson (also known as Al Jolson[note 1]) is a period-15 oscillator consisting of two blocks hassled by two pentadecathlons. It was found by Robert Wainwright in November 1984 and named by Bill Gosper.
The hassling mechanism requires two domino sparks, constantly 3 generations apart, provided by sparkers of period 9 or above (e.g. Merzenich's p31). A period 9 version that uses two snackers is possible (see below), but p14 (with tetradecathlons) is impossible.
- The name is a reference to Al Jolson, a famous American singer.
- 42P15.1 at Heinrich Koenig's Game of Life Object Catalogs