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Proof step 3 from proof validref-notin-02 (previous step)

is_valid_ref(r, st) ⊦ r ∈ st .refs

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 1:
⊦ r ∈ st .refs ↔ r ∈ st
Proof step 2:
⊦ ¬ r ∈ st → ¬ is_valid_ref(r, st)

Rule argument

[speclemmaarg: ,r ∈ st .refs ↔ r ∈ st ,[st, r] → [st, r] ,F ,storefunsx , ,refs-def ]

Additional information

[[CONCRETESIMPRULES : ()], [EXTRATERMS : (st, r)]]