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Proof step 2 from proof okarray-02 (previous step)

⊦ r = r0, okarray(refval(r), ty, i, st[r0 -- sk, val0]) ↔ okarray(refval(r), ty, i, st), is_classtype(ty), is_arraytype(ty)

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 1:
⊦ refval(rk .ref) ≠ val → (okarray(val, ty, i, st[rk, val0]) ↔ okarray(val, ty, i, st))

Rule argument

[crewrite-arg: okarray-put-07 , F , [val0, rk, st, i, ty, val] → [val0, r0 -- sk, st, i, ty, refval(r)] ]

Additional information

[[CONCRETESIMPRULES : ([CSIMPSEQ : ⊦ (r -- sk) .ref = r], [CSIMPSEQ : ⊦ refval(r) = refval(r0) ↔ r = r0])], [EXTRATERMS : (val0, r0 -- sk, st, i, ty, refval(r))]]