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

1 < j, 1 < i * j, i ≤ 0 ⊦

User applied rule cut formula

And obtained the following new goals

Proof step 9:
1 < i * j, 1 < j, i ≤ 0 ⊦ i = 0

Rule argument

fma: i = 0

Additional information

Used simplifier rules: Mult-zero: ⊦ i * 0 = 0;%associativity: ⊦ i * j * j0 = (i * j) * j0;%commutativity: ⊦ i * j = j * i; Used formulas: i = 0