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Proof step 4 from proof gfts-not (previous step)

oktype(val, sk .fs .type, st), is_fskey(sk), goodfieldsandtypes(r, sks, st) ⊦ sk = _type, goodfieldsandtypes(r, sks, st[r0 -- sk, val])

Heuristic elimination applied rule insert elim lemma

And obtained the following new goals

Proof step 3:
sk = fs ', oktype(val, fs .type, st), is_fskey(sk), goodfieldsandtypes(r, sks, st) ⊦ sk = _type, goodfieldsandtypes(r, sks, st[r0 -- sk, val])

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)]]