The rulespace is the totality of rules described by some form of notation, e.g. a certain kind of rulestrings.
The term "rulespace" may be qualified to include only rules with certain attributes, e.g. certain birth or survival conditions; the exact rules included may vary in different contexts. For example, "B3 rulespace" may be taken to include outer-totalistic Life-like cellular automata such as Conway's Game of Life (B3/S23) and Day & Night (B3678/S34678), while excluding such rules as Seeds (B2/S).
"D" ("death") conditions are sometimes used to indicate that certain survival conditions should not be included; thus, for example, the "B0/D8 rulespace" would include all rules where dead cells with no live neighbors get born in one generation, but live cells surrounded entirely by live neighbors then die again in the next generation. "A" conditions are used in the same manner to indicate that certain birth conditions should not be included; for instance, "A2 Generations rules" would include all Generations rules without B2, and "S23·D1456/B34·A5/3 rules" would include all 3-state Generations rules with B34/S23 and without any of B5/S1456.
- Re: 238/346/3 (discussion thread) at the ConwayLife.com forums