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Proof step 1 from proof square-nls (conclusion)

⊦ 0 ≤ j → ¬ (j * (j + 1)) / 2 < j

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 2:
(j * (j + 1)) / 2 < j, 0 ≤ j ⊦

Rule argument

Additional information

Used simplifier rules: forward-le-01: ⊦ i ≤ j ∧ 0 ≤ i → 0 ≤ j; (forward) from specification int-abs