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Proof step 5 from proof validrefs-delete-01 (previous step)

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

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 1:
⊦ ¬ validrefs(str, refs, ty, st) → ¬ validrefs(str, refs, ty, st -- r)
Proof step 4:
¬ ¬ validrefs(str, refs, ty, st), ty ≤ ty0, validrefs(str, refs, ty, st -- r) ⊦ validrefs(str, refs, ty0, st)

Rule argument

[crewrite-arg: validrefs-delete , F , [r, st, ty, refs, str] → [r, st, ty, refs, str] ]

Additional information

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