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Proof step 2 from proof validref-levelsubset-01 (previous step)

level⊆(str, str0), validref(str, r, ty, st) ⊦ validref(str0, r, ty, st)

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 1:
⊦ level⊆(str, str0) ∧ validref(str, r, ty, st) → validref(str0, r, ty, st)

Rule argument

[crewrite-arg: validref-levelsubset , F , [str, str0, r, ty, st] → [str, str0, r, ty, st] ]

Additional information

[[CONCRETESIMPRULES : ()], [EXTRATERMS : (str, str0, r, ty, st)]]