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Proof step 1 from proof prime-le-2 (conclusion)

⊦ prime(i) → (i ≤ 2 ↔ i = 2)

Heuristic simplifier applied rule simplifier

And closed the goal!

Rule argument

Additional information

Used simplifier rules: prime-small: ⊦ j < 2 → ¬ prime(j);%lels-02: ⊦ i ≠ j → (i ≤ j ↔ i < j); from specification int-abs