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Proof step 2 from proof numeral-1 (previous step)

m ≠ 0 ⊦ n +1 = m ↔ n = m -1

Heuristic simplifier applied rule simplifier

And closed the goal!

Rule argument

Additional information

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