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Proof step 17 from proof validref-ac (previous step)

sk .fs = mkfs(class0, ty0, fieldvar), is_indexkey(sk), ∀ str, r, ty, class, st. validref(str, r, ty, addclass(class, fis0, st)) ↔ validref(str, r, ty, st) ⊦ validref(str, r, ty, addclass(class, fis0, st)) ↔ validref(str, r, ty, st)

User applied rule all left

And closed the goal!

Rule argument

[EXRARG : pos: left 3, [extquanttermlist: (str, r, ty, class, st) abort:F , discard:T , computed:T ]]

Additional information

[[CONCRETESIMPRULES : ()], [EXTRATERMS : (str, r, ty, class, st)]]