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Proof step 12 from proof eq-nonzero (previous step)

i * j = i * j0, 0 < i ⊦ j = j0

User applied rule cut formula

And obtained the following new goals

Proof step 13:
j < j0, i * j = i * j0, 0 < i ⊦ j = j0
Proof step 16:
i * j = i * j0, 0 < i ⊦ j < j0, j = j0

Rule argument

fma: j < j0

Additional information

Used formulas: j < j0