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Proof step 61 from proof Binom-theorem-countFun (previous step)

⊦ Σ countFun(i2, i1 - 1, λ j0. i * binom_coef(i1, j0) * i ^ j0 * i0 ^ (i1 - j0)) = Σ countFun(i2 + 1, i1, λ j0. i * binom_coef(i1, j0 - 1) * i ^ (j0 - 1) * i0 ^ (i1 - (j0 - 1)))

Lemma countFun-shift