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Proof step 21 from proof square-le-04 (previous step)

0 ≤ j, 0 ≤ i ⊦ j < i, i + i * i ≤ j + j * j

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 22:
j + j * j < i + i * i, 0 ≤ i, 0 ≤ j, i ≤ j ⊦

Rule argument

Additional information

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