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Proof step 14 from proof le-one (previous step)

i < 0, 1 < i * j, 1 < j ⊦ i = 0, j < 0, 0 < i * j

User applied rule weakening

And obtained the following new goals

Proof step 15:
1 < i * j ⊦ 0 < i * j

Rule argument

poslist: left 1, left 3, right 1, right 2

Additional information