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Proof step 3 from proof add-gft (previous step)

is_indexkey(sk) ⊦ r = r0, goodfieldandtype(r0, sk, addarray(r, ty, vals, st)) ↔ goodfieldandtype(r0, sk, st)

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 2:
⊦ is_indexkey(sk) ↔ (∃ i. sk = i ')

Rule argument

[speclemmaarg: ,is_indexkey(sk) ↔ (∃ i. sk = i ') ,[sk] → [sk] ,F ,storekey , ,ex-04 ]

Additional information

[[CONCRETESIMPRULES : ([CSIMPSEQ : ⊦ ¬ goodfieldandtype(r, i ', st)])], [EXTRATERMS : (sk)]]