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UpperVandermonde(AngouriMath.Entity,AngouriMath.Entity.Variable,AngouriMath.Entity,AngouriMath.Entity)
Method (no overloads)
Summary
binomial(j, a) binomial(m - j, b) summed over j from zero to m:
binomial(m + 1, a + b + 1), Vandermonde's convolution along the upper indices
(Prob 8.9.18, sum(binomial(i - 1, 2) binomial(n - i, 2), i, 1, n) = binomial(n, 5)):
choosing a + b + 1 of m + 1 in a row, by which of them is the
(a + 1)-th. The index may be shifted, j = i + p, as long as the range is the
whole of 0 <= j <= m: below zero the first coefficient is not zero.
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