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Proof step 18 from proof isobj-addobj-04 (previous step)

sk .fs = mkfs(class0, ty, fieldvar), fis .keys = instfields(class), is_indexkey(sk), sk ∈ fis, validfieldinits(fis, st), sk ∈ instfields(class) ⊦ r = jvmref

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 16:
⊦ is_indexkey(sk) ↔ (∃ i. sk = i ')
Proof step 17:
⊦ ¬ i ' ∈ instfields(class)

Rule argument

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

Additional information

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