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.
One of the phases of Jolson, which led to its name
- ↑ The name is in reference to Al Jolson, the famous American singer.
- ↑ Mark Niemiec. Re: Oscillator Discussion Thread (discussion thread) at the ConwayLife.com forums
- 42P15.1 at Heinrich Koenig's Game of Life Object Catalogs