| ⊦ fis .keys = statfields(class) ∧ okfieldinits(class, fis) ∧ compat(str, st) → compat(str, addclass(class, fis, st)) |
fis .keys = statfields(class), compat(str, st), okfieldinits(class, fis) ⊦ compat(str, addclass(class, fis, st))
[[CONCRETESIMPRULES : ()]]