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Proof step 1 from proof div2-nls (conclusion)

⊦ i ≤ j → ¬ j < (i + j) / 2

Heuristic simplifier applied rule simplifier

And obtained the following new goals

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

Rule argument

Additional information

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