| r ∈ st, ∀ r, st, class1. r ∈ st → r ∈ addclass(class1, fis0, st) ⊦ r ∈ addclass(class1, fv ' + fis0, st) |
⊦ is_fskey(fv .1) ∧ fv .1 .fs .class ≠ class → addclass(class, fv ' + fis, st) = addclass(class, fis, st)
¬ (is_fskey(fv .1) ∧ fv .1 .fs .class ≠ class1), r ∈ st, ∀ r, st, class1. r ∈ st → r ∈ addclass(class1, fis0, st) ⊦ r ∈ addclass(class1, fv ' + fis0, st)
is_fskey(fv .1) ∧ fv .1 .fs .class ≠ class1, r ∈ st, ∀ r, st, class1. r ∈ st → r ∈ addclass(class1, fis0, st) ⊦ r ∈ addclass(class1, fis0, st)
[[CONCRETESIMPRULES : ()], [EXTRATERMS : (st, fis0, fv, class1)]]