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Proof step 1 from proof two-01 (conclusion)

⊦ m ≤ 2 → (prime(m) ↔ m = 2)

Heuristic simplifier applied rule simplifier

And closed the goal!

Rule argument

Additional information

Used simplifier rules: two: ⊦ prime(2);%lstwo: ⊦ m < 2 → ¬ prime(m);%lels-02: ⊦ m ≠ n → (m ≤ n ↔ m < n); from specification nat