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Proof step 17 from proof is_valid_ref-def (previous step)

is_valid_ref(str, r, st), ¬ is_valid_ref(r, st) ∨ ¬ is_obj(str, r, st) ∧ ¬ is_array(str, r, st) ⊦

User applied rule insert rewrite lemma

And obtained the following new goals

Rule argument

[crewrite-arg: is-valid-ref-stronger-def , F , [st, r, str] → [st, r, str] ]

Additional information

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