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Proof step 5 from proof square-nls (previous step)

j * (j + 1) = i0 * 2 + j0, j0 < 2, i0 < j, 0 ≤ j, 0 ≤ j0, 0 ≤ i0, 0 < j ⊦

User applied rule cut formula

And obtained the following new goals

Proof step 6:
j * (j + 1) < (i0 + 1) * 2, j * (j + 1) = i0 * 2 + j0, j0 < 2, i0 < j, 0 ≤ j, 0 ≤ j0, 0 ≤ i0, 0 < j ⊦
Proof step 15:
j * (j + 1) = i0 * 2 + j0, j0 < 2, i0 < j, 0 ≤ j, 0 ≤ j0, 0 ≤ i0, 0 < j ⊦ j * (j + 1) < (i0 + 1) * 2

Rule argument

fma: j * (j + 1) < (i0 + 1) * 2

Additional information

Used formulas: j * (j + 1) < (i0 + 1) * 2