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Proof step 1 from proof mult-01 (conclusion)

⊦ m ≠ 1 ∧ n0 + 1 < n → ¬ prime(m * n)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 2:
prime(m * n), n0 + 1 < n ⊦ m = 1, n = 0

Rule argument

Additional information

Used simplifier rules: f: ⊦ m < n → n ≠ 0; (forward) from specification nat-basic1