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Proof step 2 from proof elim-pred-c (previous step)

⊦ m = n - 1 ↔ n = m + 1, n = 0

Heuristic simplifier applied rule simplifier

And closed the goal!

Rule argument

Additional information

Used simplifier rules: num-02: n ≠ 0 ⊦ (n - 1) + 1 = n;%num-01: ⊦ n + 1 - 1 = n;%c: ⊦ m + n = n + m; from specification nat-basic%a: ⊦ (m + n0) + n1 = m + n0 + n1; from specification nat-basic