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Proof step 69 from proof validref-subspec-samesubclasses (previous step)

tdname+∃(str0, class), same-subclasses-contains(class, str, str0), validref(str0, r, mkclasstype(class), st) ⊦ validref(str, r, mkclasstype(class), st)

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 1:
⊦ validref(str, r, ty, st) ↔ okreftype(refval(r), ty, st) ∧ ¬ junkref(str, r, st)
Proof step 68:
tdname+∃(str0, class), same-subclasses-contains(class, str, str0), validref(str0, r, mkclasstype(class), st) ⊦ okreftype(refval(r), mkclasstype(class), st) ∧ ¬ junkref(str, r, st)

Rule argument

[speclemmaarg: , validref(str, r, ty, st) ↔ okreftype(refval(r), ty, st) ∧ ¬ junkref(str, r, st) ,[st, ty, r, str] → [st, mkclasstype(class), r, str] ,F ,junkrefs , ,validref-okreftype ]

Additional information

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