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Proof step 4 from proof le-two (previous step)

i ≤ j ⊦ 2 * i ≤ 2 * j + 1

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 5:
i ≤ j, 2 * j + 1 < 2 * i ⊦

Rule argument

Additional information

Used simplifier rules: lels-01: ⊦ ¬ i ≤ j ↔ j < i; from specification int-abs