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Proof step 3 from proof modlep (previous step)

j0 < j, i0 < i, 0 < j, j * i ≤ j * i0 + j0, 0 ≤ j0 ⊦

User applied rule cut formula

And obtained the following new goals

Proof step 4:
j * i = j * i0 + j0, 0 < j, i0 < i, j0 < j, 0 ≤ j0, j * i ≤ j * i0 + j0 ⊦
Proof step 7:
0 < j, i0 < i, j0 < j, 0 ≤ j0, j * i ≤ j * i0 + j0 ⊦ j * i = j * i0 + j0

Rule argument

fma: j * i = j * i0 + j0

Additional information

Used formulas: j * i = j * i0 + j0