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Proof step 15 from proof coef-mult-rec-lower (previous step)

(fac(i - j) * fac(j)) * i0 = fac(i), j ≤ i, 0 < i, 0 ≤ j, 0 ≤ i, fac(i + 1 - j) * fac(j - 1) | fac(i), 0 < j ⊦ fac(i) / (fac(i - j) * fac(j)) * j = fac(i) / (fac(i + 1 - j) * fac(j - 1)) * (i + 1 - j)

User applied rule insert equation

And obtained the following new goals

Rule argument

pos: left 1 flags: rotate

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