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Proof step 8 from proof le-neg (previous step)

i < 0, i * i0 < i * j, i * j ≤ i * i0, i < 0 ⊦

User applied rule weakening

And obtained the following new goals

Proof step 9:
i * i0 < i * j, i * j ≤ i * i0 ⊦

Rule argument

poslist: left 1, left 4

Additional information