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Proof step 2 from proof instfields-index-02 (previous step)

sk .fs = mkfs(class, ty, fieldvar), sk ∈ instfields(class0) ⊦ sk = mkfs(class, ty, fieldvar) '

User applied rule insert elim lemma

And obtained the following new goals

Proof step 1:
⊦ is_indexkey(sk) → ¬ sk ∈ instfields(class)

Rule argument

[speclemmaarg: ,is_fskey(sk) → (fs = sk .fs ↔ sk = fs ') ,[sk, fs] → [sk, fs] ,T ,storekey , ,elim-03 ]

Additional information

[[CONCRETESIMPRULES : ([CSIMPSEQ : ⊦ ¬ is_fskey(sk) ↔ is_indexkey(sk)], [CSIMPELIM : ⊦ is_fskey(sk) → (fs = sk .fs ↔ sk = fs ')])], [EXTRATERMS : (sk, fs)]]