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Proof step 2 from proof zero-04 (previous step)

m * n = m0 ⊦ m0 = m * n0 ↔ m = 0 ∨ n = n0

Heuristic simplifier applied rule simplifier

And closed the goal!

Rule argument

Additional information

Used simplifier rules: zero-02: ⊦ m * n = m * n0 ↔ m = 0 ∨ n = n0;%mult-a: ⊦ m0 * m * n = (m0 * m) * n;%mult-c: ⊦ m * n = n * m;%zero: ⊦ 0 * n = 0;