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Proof step 6 from proof levelsubset-classex (previous step)

class+∃(str, class), level⊆(str, str0) ⊦ class+∃(str0, class)

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 1:
⊦ class+∃(str, class) ↔ class∃(str, class) ∨ is_predefined_class(class)
Proof step 5:
class∃(str, class) ∨ is_predefined_class(class), level⊆(str, str0) ⊦ class+∃(str0, class)

Rule argument

[speclemmaarg: ,class+∃(str, class) ↔ class∃(str, class) ∨ is_predefined_class(class) ,[class, str] → [class, str] ,F ,typefuns , ,classex-def ]

Additional information

[[CONCRETESIMPRULES : ()], [EXTRATERMS : (class, str)]]