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Proof step 3 from proof validrefs-delete-01 (previous step)

validrefs(str, refs, ty, st -- r), ty ≤ ty0, validrefs(str, refs, ty, st) ⊦ validrefs(str, refs, ty0, st)

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 2:
⊦ validrefs(str, refs, ty, st) ∧ ty ≤ ty0 → validrefs(str, refs, ty0, st)

Rule argument

[crewrite-arg: validrefs-superclass , F , [str, refs, ty, st, ty0] → [str, refs, ty, st, ty0] ]

Additional information

[[CONCRETESIMPRULES : ()], [EXTRATERMS : (str, refs, ty, st, ty0)]]