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Proof step 8 from proof same-subclasses (previous step)

contains(str0, mkclasstype(class), ty .jtelemtype), contains(str0, mkclasstype(class), ty), same-subclasses-contains(class, str, str0), has_classtype(ty), tdname+∃(str, ty .jtelemtype .class) ⊦ type∃(str, ty), is_classtype(ty)

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 7:
⊦ type∃(str, ty) ↔ ¬ has_classtype(ty) ∨ tdname+∃(str, ty .jtclass)

Rule argument

[speclemmaarg: ,type∃(str, ty) ↔ ¬ has_classtype(ty) ∨ tdname+∃(str, ty .jtclass) ,[ty, str] → [ty, str] ,F ,typefuns , ,typeex-def ]

Additional information

[[CONCRETESIMPRULES : ([CSIMPSEQ : ⊦ ty .jtclass = ty .jtelemtype .class])], [EXTRATERMS : (ty, str)]]