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Concrete mathematics : a foundation for computer science

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240 BINOMIAL COEFFICIENTS<br />

86 Let al, . . . , a,, be nonnegative integers, and let C(al,. . . , a,,) be the<br />

coefficient of the constant term 2:. . .zt when the n(n - 1) factors<br />

are fully expanded into positive and negative powers of the complex variables<br />

~1, . . . . z,,.<br />

a Prove that C(al , . . . , a,) equals the left-hand side of (5.31).<br />

b Prove that if 21, . . , z,, are distinct complex numbers, then the<br />

polynomial<br />

C<br />

f(4 = f 11 s<br />

k=l l

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