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Proof step 21 from proof okarray-put-08 (previous step)

is_fskey(sk) ⊦ sk = _length, sk = _type, okarray(val, ty, i, st[r -- sk, val0]) ↔ okarray(val, ty, i, st)

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 1:
⊦ is_fskey(sk) ↔ (∃ fs. sk = fs ')
Proof step 20:
∃ fs. sk = fs ' ⊦ sk = _length, sk = _type, okarray(val, ty, i, st[r -- sk, val0]) ↔ okarray(val, ty, i, st)

Rule argument

[speclemmaarg: ,is_fskey(sk) ↔ (∃ fs. sk = fs ') ,[sk] → [sk] ,F ,storekey , ,ex-03 ]

Additional information

[[CONCRETESIMPRULES : ()], [EXTRATERMS : (sk)]]