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

class∃(str, class) ∨ is_predefined_class(class), level⊆(str, str0) ⊦ class∃(str0, class) ∨ is_predefined_class(class)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 3:
⊦ class∃(str, class) ∧ level⊆(str, str0) → (¬ class∃(str0, class) ↔ false)

Rule argument

[emptyarg]

Additional information

[[CONCRETESIMPRULES : ()]]