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Proof step 3 from proof zero (previous step)

⊦ 0 / j = 0, j = 0

User applied rule cut formula

And obtained the following new goals

Proof step 4:
j < 0 ⊦ 0 / j = 0, j = 0
Proof step 6:
⊦ 0 / j = 0, j = 0, j < 0

Rule argument

fma: j < 0

Additional information

Used formulas: j < 0