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

⊦ 0 ≤ j ∧ i ≤ 0 → ¬ (j * (j + 1)) / 2 < i + j

Heuristic simplifier applied rule simplifier

And obtained the following new goals

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

Rule argument

Additional information

Used simplifier rules: zero-gels-04: ⊦ i ≤ 0 ∧ 0 ≤ j → i ≤ j; from specification int-abs%forward-le-01: ⊦ i ≤ j ∧ 0 ≤ i → 0 ≤ j; (forward) from specification int-abs%forward-lele: ⊦ j ≤ j0 ∧ j0 ≤ j1 → j ≤ j1; (forward) from specification int-abs%forward-le-04: ⊦ j ≤ i ∧ i ≤ 0 → j ≤ 0; (forward) from specification int-abs