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Proof step 1 from proof div2-nls-02 (conclusion)

⊦ i ≤ j → ¬ (i + j) / 2 < i

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 2:
(i + j) / 2 < i, i ≤ j, (i + j) / 2 < j ⊦

Rule argument

Additional information

Used simplifier rules: forward-lsle: ⊦ i < j ∧ j ≤ j0 → i < j0; (forward) from specification int-abs