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Proof step 3 from proof pls-neg (previous step)

i * j < i * j0, j0 < 0, i0 < 0, j < 0, i < 0, i0 * j0 ≤ i * j, j0 < j, i0 ≤ i, j0 < ~1 ⊦

User applied rule insert spec-lemma

And obtained the following new goals

Proof step 4:
⊦ i ≤ j ∧ j < j0 → i < j0

Rule argument

spec: int-abs inst: name: forward-lels seq: ⊦ i ≤ j ∧ j < j0 → i < j0 subst: [i, j, j0] → [i0 * j0, i * j, i * j0] flags:

Additional information

Used simplifier rules: ls-neg: ⊦ i < 0 → (i * j < i * j0 ↔ j0 < j);%associativity: ⊦ i * j * j0 = (i * j) * j0;%commutativity: ⊦ i * j = j * i;%lenls: ⊦ i ≤ j → ¬ j < i; from specification int-abs Used terms: i0 * j0, i * j, i * j0