# DryLife

DryLife | ||

| ||

Rulestring | 23/37 B37/S23 | |
---|---|---|

Rule integer | 6280 | |

Character | Exploding |

**DryLife** is a Life-like cellular automaton in which cells survive from one generation to the next if they have 2 or 3 neighbours, and are born if they have 3 or 7 neighbours.

## Patterns

DryLife is so named because the standard spaceships from normal life; lightweight spaceship, middleweight spaceship, and heavyweight spaceship — also known as "fishes" — do not work, though the glider does. Some other spaceships, such as the weekender and loafer, work in this rule. The copperhead evolves into the closely related c/10 *goldenhead*, differing from copperhead by two cells in one phase.

Two correctly spaced B-heptominoes (as in the twin bees shuttle) act as a c/2 orthogonal puffer.

A new speed allowed by DryLife is 9c/28 orthogonal. Technology travelling at this speed relies on the R-pentomino. There is a small 9c/28 orthogonal pond puffer, and a 9c/28 spaceship. Guns and breeders have been constructed that fire spaceships and rakes of this speed respectively.

The "flower garden", a common constellation which evolves from honey farm predecessors, composed of two bi-boats and two cis-mirrored R-bees, is shown to the right.

## Universality

There is a proof sketch of this rule's universality. It is on conwaylife forums^{[1]}, which contains a proof-scheme covering all rules that support glider and their rulestring matches B3[678]*/S23[678]*.

## References

## External links

- DryLife at David Eppstein's Glider Database

- Taming B37/S23 (discussion thread) at the ConwayLife.com forums