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Proof step 1 from proof four (conclusion)

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

Heuristic simplifier applied rule simplifier

And closed the goal!

Rule argument

Additional information

Used simplifier rules: four-01: ⊦ m ≠ 2 ∧ m ≠ 1 ∧ m ≠ 0 → (m < 4 ↔ m = 3);%lels-02: ⊦ m ≠ n → (m ≤ n ↔ m < n); from specification nat