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Proof step 17 from proof eq-nonzero (previous step)

i * j = i * j0, 0 < i ⊦ j = j0, j < j0

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 18:
i * j = i * j0, 0 < i, j0 < j ⊦

Rule argument

Additional information

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