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Proof step 4 from proof levelsubset-classex-02 (previous step)

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

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))
Proof step 3:
class+∃(str, class), (∀ class. class∃(str, class) → class∃(str0, class)) ∧ (∀ class. interface∃(str, class) → interface∃(str0, class)), interface∃(str0, class) ⊦

Rule argument

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

Additional information

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