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Proof step 4 from proof eq-nonzero (previous step)

i * j = i * j0, i < 0 ⊦ i = 0, j = j0

User applied rule cut formula

And obtained the following new goals

Proof step 5:
i * j = i * j0, i < 0, j < j0 ⊦ i = 0, j = j0
Proof step 8:
i * j = i * j0, i < 0 ⊦ i = 0, j = j0, j < j0

Rule argument

fma: j < j0

Additional information

Used formulas: j < j0