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Proof step 18 from proof contains-subex (previous step)

has_classtype(ty0), contains(str0, ty, ty0), ∀ class1. contains(str0, ty, mkclasstype(class1)) → tdname+∃(str, class1) ⊦ tdname+∃(str, ty0 .jtelemtype .class)

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 4:
⊦ has_classtype(ty) ↔ is_classtype(ty .jtelemtype)
Proof step 17:
is_classtype(ty0 .jtelemtype), contains(str0, ty, ty0), ∀ class1. contains(str0, ty, mkclasstype(class1)) → tdname+∃(str, class1) ⊦ tdname+∃(str, ty0 .jtelemtype .class)

Rule argument

[speclemmaarg: ,has_classtype(ty) ↔ is_classtype(ty .jtelemtype) ,[ty] → [ty0] ,F ,typefuns , ,has-classtype ]

Additional information

[[CONCRETESIMPRULES : ()], [EXTRATERMS : (ty0)]]