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Proof step 67 from proof validref-subspec-samesubclasses (previous step)

tdname+∃(str0, class), same-subclasses-contains(class, str, str0), okreftype(refval(r), mkclasstype(class), st) ∧ ¬ junkref(str0, r, st) ⊦ okreftype(refval(r), mkclasstype(class), st) ∧ ¬ junkref(str, r, st)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 66:
tdname+∃(str0, class), same-subclasses-contains(class, str, str0), okreftype(refval(r), mkclasstype(class), st), junkref(str, r, st) ⊦ junkref(str0, r, st)

Rule argument

[emptyarg]

Additional information

[[CONCRETESIMPRULES : ()]]