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Proof step 2 from proof okbytearray-put-field-04 (previous step)

is_fskey(sk) ⊦ sk .fs ' = _length, sk .fs ' = _type, okbytearray(r, st[r0 -- sk, val]) ↔ okbytearray(r, st)

Heuristic elimination applied rule insert elim lemma

And obtained the following new goals

Proof step 1:
⊦ fs ' ≠ _length ∧ fs ' ≠ _type → (okbytearray(r, st[r0 -- fs ', val]) ↔ okbytearray(r, st))

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)]]