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Proof step 4 from proof gft-not-01 (previous step)

oktype(val, ty, st), goodfieldandtype(r, sk, st), is_indexkey(sk) ⊦ mkfs(class0, ty, fieldvar) ' = _type, goodfieldandtype(r, sk, st[r0 -- mkfs(class0, ty, fieldvar) ', val])

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 2:
⊦ is_indexkey(sk) ↔ (∃ i. sk = i ')
Proof step 3:
⊦ ¬ goodfieldandtype(r, i ', st)

Rule argument

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

Additional information

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