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Proof step 4 from proof unchNorec-isvalidref-01 (conclusion)

⊦ unchangedNorec(r, st, st0) ∧ is_valid_ref(str, r, st0) → (¬ is_valid_ref(str, r, st) ↔ false)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 3:
unchangedNorec(r, st, st0), is_valid_ref(str, r, st0) ⊦ is_valid_ref(str, r, st)

Rule argument

[emptyarg]

Additional information

[[CONCRETESIMPRULES : ()]]