Object

An object is formally defined as follows:

1. A cluster of adjacent living cells (e.g. block, tub, beacon, glider)
2. Two objects close to each other in such a way that they suppress one or more births that would occur if they were separated (e.g. aircraft carrier)
3. Two periodic objects that interact as described above in at least one of their phases (e.g. beacon, two pentadecathlons shuttling a glider)

Still-lifes are non-moving objects with a period of one. Oscillators are non-moving objects with a period greater than one. Spaceships are moving periodic objects.

Pseudo-object

A pseudo object is formed when two or more objects and/or pseudo-objects are close to each other in such a way that adjacent empty cells do not change their behaviors, but the reason births do not form is due to over-population rather than under-population, and there is at least one way that the clusters can be separated into disjoint sets that operate the same way (e.g. bi-block separates into two blocks).

In most cases, this separation can be done into two sets, but there have been examples found that require three or even four sets (four is the maximum, given the 4-color map theorem).

Note that objects can fit this definition, but they are generally classed separately, in the same way that still-lifes are technically trivial period-1 oscillators but are not generally classified as such.

Pseudo-still-lifes, pseudo-oscillators, and pseudo-spaceships are pseudo-objects similar to the above (e.g. bi-block, block on beacon, LWSS-on-LWSS).

Quasi-object

A quasi-object is formed when two or more objects and/or pseudo-objects and/or or quasi-objects are close to each other in such a way that they share adjacent empty cells (e.g. two adjacent tubs).

Note that objects and pseudo-objects can fit this definition but are generally classed separately.

Quasi-still-lifes, quasi-oscillators and quasi-spaceships are quasi-objects similar to the above (e.g. tub near tub, tub near beacon, two nearby gliders).

Gallery

Objects

x = 4, y = 3, rule = B3/S23 2b2o$o2bo$2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THUMBSIZE 2 ]] The two pre-blocks that form an aircraft carrier suppress the birth of the cell between them (click above to open LifeViewer) RLE: here Plaintext: here

2o$2o$2b2o$2b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THUMBSIZE 2 AUTOSTART GPS 2 ]] The two parts of a beacon suppress the birth of the cells between them every other tick (click above to open LifeViewer) RLE: here Plaintext: here

x = 35, y = 7, rule = B3/S23 2bo4bo$2ob4ob2o$2bo4bo$16bo$17b2o8bo4bo$16b2o7b2ob4ob2o$27bo4bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THUMBSIZE 2 AUTOSTART GPS 2 ]] Two pentadecathlons shuttling a glider (click above to open LifeViewer) RLE: here Plaintext: here

External links

• Four color theorem at Wikipedia