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Proof step 3 from proof statfields-index-01 (previous step)

is_indexkey(sk), sk ∈ statfields(class) ⊦

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 1:
⊦ is_indexkey(sk) ↔ (∃ i. sk = i ')
Proof step 2:
⊦ ¬ i ' ∈ statfields(class)

Rule argument

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

Additional information

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