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Proof step 1 from proof four-01 (conclusion)

⊦ m ≠ 2 ∧ m ≠ 1 ∧ m ≠ 0 → (m < 4 ↔ m = 3)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 2:
m < 4 ⊦ m = 0, m = 1, m = 2, m = 3

Rule argument

Additional information

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