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Proof step 1 from proof psu-01 (conclusion)

⊦ m ≠ 0 ∧ m ≠ 1 → m -1 -1 +1 = m -1

Heuristic simplifier applied rule simplifier

And closed the goal!

Rule argument

Additional information

Used simplifier rules: psu-02: ⊦ n -1 +1 ≠ n ↔ n = 0;%psh-03: ⊦ m ≠ 0 → (m -1 = n ↔ m = n +1);