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Proof step 21 from proof validref-ac (previous step)

fv = sk × val, ∀ str, r, ty, class, st. validref(str, r, ty, addclass(class, fis0, st)) ↔ validref(str, r, ty, st) ⊦ validref(str, r, ty, addclass(class, fv ' + fis0, st)) ↔ validref(str, r, ty, st), ¬ is_indexkey(sk) ∧ sk .fs .class ≠ class

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 20:
∀ str, r, ty, class, st. validref(str, r, ty, addclass(class, fis0, st)) ↔ validref(str, r, ty, st) ⊦ validref(str, r, ty, addclass(class, (sk × val) ' + fis0, st)) ↔ validref(str, r, ty, st), ¬ is_indexkey(sk) ∧ sk .fs .class ≠ class

Rule argument

[emptyarg]

Additional information

[[CONCRETESIMPRULES : ()]]