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Proof step 2 from proof levelsubset-ref (conclusion)

⊦ level⊆(str, str)

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 1:
⊦ level⊆(str, str0) ↔ (∀ class. class∃(str, class) → class∃(str0, class)) ∧ (∀ class. interface∃(str, class) → interface∃(str0, class))

Rule argument

[crewrite-arg: levelsubset-def, F, [str0, str] → [str, str]]

Additional information

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