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Proof step 5 from proof levelsubset-classex-03 (previous step)

class+∃(str0, class), interface∃(str, class), ∀ class. interface∃(str, class) → interface∃(str0, class), ∀ class. class∃(str, class) → class∃(str0, class) ⊦

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 2:
⊦ class+∃(str, class) ↔ class∃(str, class) ∨ is_predefined_class(class)
Proof step 4:
class∃(str0, class) ∨ is_predefined_class(class), interface∃(str, class), ∀ class. interface∃(str, class) → interface∃(str0, class), ∀ class. class∃(str, class) → class∃(str0, class) ⊦

Rule argument

[speclemmaarg: ,class+∃(str, class) ↔ class∃(str, class) ∨ is_predefined_class(class) ,[class, str] → [class, str0] ,F ,typefuns , ,classex-def ]

Additional information

[[CONCRETESIMPRULES : ()], [EXTRATERMS : (class, str0)]]