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Proof step 5 from proof square-lez (previous step)

0 < i ∧ i < 0 ∨ i < 0 ∧ 0 < i ⊦

Heuristic cut applied rule cut formula

And closed the goal!

Rule argument

fma: i < 0

Additional information

Used simplifier rules: ⊦ i < j ↔ ¬ j ≤ i; (ss)% ⊦ i < j → ¬ j < i; (s) Used formulas: i < 0