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Proof step 1 from proof band-neg (conclusion)

⊦ i < 0 ∧ j < 0 → ¬ 0 ≤ band(i, j)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 2:
j < 0, i < 0, 0 ≤ band(i, j) ⊦

Rule argument

Additional information

Used simplifier rules: ⊦ i < 0 ∧ 0 ≤ j → i < j;% ⊦ i ≤ j ∧ 0 ≤ i → 0 ≤ j; (forward)% ⊦ j < i ∧ i ≤ 0 → j < 0; (forward)% ⊦ i < j ∧ j ≤ j0 → i < j0; (forward)