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Proof step 1 from proof ls-le (conclusion)

⊦ a < b → (¬ b < a ↔ true)

Heuristic simplifier applied rule simplifier

And closed the goal!

Rule argument

Additional information

Used simplifier rules: transitivity: ⊦ a < b ∧ b < c → a < c;%irreflexivity: ⊦ ¬ a < a;