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Proof step 19 from proof validstatfields-addclass-other (previous step)

sk .fs = mkfs(class1, ty, fieldvar), is_indexkey(sk), sk ∈ statfields(class0), ∀ sk. sk ∈ statfields(class0) → validstatfield(str, sk, st) ⊦ class = `java.lang.Object' .class, class = class0, validstatfield(str, sk, addclass(class, fis, st))

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 18:
⊦ is_indexkey(sk) ↔ (∃ i. sk = i ')

Rule argument

[speclemmaarg: ,is_indexkey(sk) ↔ (∃ i. sk = i ') ,[sk] → [sk] ,F ,storekey , ,ex-04 ]

Additional information

[[CONCRETESIMPRULES : ([CSIMPSEQ : ⊦ ¬ i ' ∈ statfields(class)])], [EXTRATERMS : (sk)]]