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Proof step 4 from proof validref-del (previous step)

is_valid_ref(r, st -- r) ⊦

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 1:
⊦ is_valid_ref(r, st) ↔ is_obj(r, st) ∨ is_array(r, st)
Proof step 3:
is_obj(r, st -- r) ∨ is_array(r, st -- r) ⊦

Rule argument

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

Additional information

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