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Proof step 1 from proof mult-03 (conclusion)

⊦ 2 ≤ m ∧ 2 ≤ n → ¬ prime(m * n)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 2:
prime(m * n), 2 ≤ m, 2 ≤ n ⊦ m = 0, n = 0

Rule argument

Additional information

Used simplifier rules: not-zero: 0 < n ⊦ (* n) ≤ m → m ≠ 0; (forward) from specification nat