Introduction | Bibliography

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:J = Herschel

:jack (p4) Found by Robert Wainwright, April 1984.

    ...O.....O...
    ...OO...OO...
    O..OO...OO..O
    OOO..O.O..OOO
    .....O.O.....
    OOO..O.O..OOO
    O..OO...OO..O
    ...OO...OO...
    ...O.....O...

:jagged lines A pattern constructed by Dean Hickerson in May 2005 that uses puffers to produce a line of bi-blocks that weaves back and forth in a complicated way.

:jam (p3) Found by Achim Flammenkamp in 1988, but not widely known about until its independent discovery (and naming) by Dean Hickerson in September 1989. Compare with mold. In fact this is really very like caterer. In terms of its 7x7 bounding box it ties with trice tongs as the smallest p3 oscillator.

    ...OO.
    ..O..O
    O..O.O
    O...O.
    O.....
    ...O..
    .OO...

:JavaLifeSearch See lifesrc.

:Jaws A breeder constructed by Nick Gotts in February 1997. In the original version Jaws had an initial population of 150, which at the time was the smallest for any known pattern with superlinear growth. In November 1997 Gotts produced a 130-cell Jaws using some switch engine predecessors found by Paul Callahan. See switch-engine ping-pong for the lowest-population superlinear growth pattern as of July 2018, along with a list of the record-holders.

Jaws consists of eight pairs of switch engines which produce a new block-laying switch engine (plus masses of junk) every 10752 generations. It is therefore an MMS breeder.

:JC = dead spark coil

:JHC John Horton Conway. Also another name for monogram.

:J-heptomino = Herschel

:JLS = JavaLifeSearch

:Jolson (p15) Two blocks hassled by two pentadecathlons. Found by Robert Wainwright in November 1984 and named by Bill Gosper. A p9 version using snackers instead of pentadecathlons is also possible.

    .OO......OO..
    O..O....O..O.
    O..O....O..O.
    O..O....O..O.
    .OO......OO..
    .............
    .............
    .......O.....
    .....O..O.OO.
    ......OO..OO.
    .............
    .............
    ......OOOO...
    .....OOOOOO..
    ....OOOOOOOO.
    ...OO......OO
    ....OOOOOOOO.
    .....OOOOOO..
    ......OOOO...

:junk = ash.

:Justyna (stabilizes at time 26458) The following methuselah found by Andrzej Okrasinski in May 2004.

    .................O....
    ................O..O..
    .................OOO..
    .................O..O.
    ......................
    OO................O...
    .O................O...
    ..................O...
    ......................
    ......................
    ......................
    ......................
    ......................
    ......................
    ......................
    ...................OOO
    ...........OOO........

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