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Proof step 2 from proof good-field-field (previous step)

is_fskey(sk) ⊦ goodfieldandtype(r, sk, st) ↔ r -- sk ∈ st ∧ okval(st[r -- sk], sk .fs .type)

Heuristic elimination applied rule insert elim lemma

And obtained the following new goals

Proof step 1:
⊦ goodfieldandtype(r, fs ', st) ↔ ¬ ¬ (r -- fs ' ∈ st ∧ okval(st[r -- fs '], fs .type))

Rule argument

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

Additional information

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