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Proof step 13 from proof is_valid_ref-02 (conclusion)

⊦ is_obj(r, class, st) → (is_valid_ref(str, r, st) ↔ class+∃(str, class) ∧ ¬ is_abstract(class))

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Rule argument

[emptyarg]

Additional information

[[CONCRETESIMPRULES : ()]]