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Proof step 1 from proof sum-not-ls-zero (conclusion)

∀ i. i ∈ ints → 0 ≤ i ⊦ ¬ Σ ints < 0

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 2:
Σ ints < 0, ∀ i. i ∈ ints → 0 ≤ i ⊦

Rule argument

Additional information

Used simplifier rules: forward-le-02: ⊦ j < i ∧ i ≤ 0 → j < 0; (forward) from specification int-abs