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Proof step 2 from proof leone-two (previous step)

⊦ i / 2 ≤ 1 ↔ i ≤ 3

User applied rule cut formula

And obtained the following new goals

Proof step 3:
⊦ i / 2 ≤ 1 ↔ i ≤ 3, i < 0

Rule argument

fma: i < 0

Additional information

Used simplifier rules: lstwozero: ⊦ i < 0 → ¬ 0 < i / 2;% ⊦ i < 0 ∧ 0 ≤ j → i ≤ j; (s)% ⊦ i ≤ j ↔ ¬ j < i; (ss)%forward-pos: ⊦ i < j ∧ 0 < i → 0 < j ∧ 1 < j; (forward) from specification int-basic1%forward-le-05: ⊦ i < j ∧ 0 ≤ i → 0 < j; (forward) from specification int-abs%forward-le-02: ⊦ j < i ∧ i ≤ 0 → j < 0; (forward) from specification int-abs Used formulas: i < 0