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Proof step 1 from proof ilf-03 (conclusion)

⊦ ¬ m -1 -1 < m → m = 0 ∨ m = 1

Heuristic simplifier applied rule simplifier

And closed the goal!

Rule argument

Additional information

Used simplifier rules: psh-06: ⊦ n ≠ 0 ∧ n ≠ 1 → (n -1 -1 < m ↔ n < m +1 +1);%s: ⊦ m < n +1 ↔ ¬ n < m;%ls-01: ⊦ ¬ m +1 < m;