Mathematical Methods in the Physical Sciences · Problem 4.19

FUNCTIONS OF A COMPLEX VARIABLE — Mary Boas

Mathematics — Methods · statistical-mechanics-general

Problem

(a) Following the methods of Examples 3, 4, and 5, show that the number of equally likely ways of putting NN particles in nn boxes, n>Nn > N, is nNn^N for Maxwell-Boltzmann particles, C(n,N)C(n, N) for Fermi-Dirac particles, and C(n−1+N,N)C(n - 1 + N, N) for Bose-Einstein particles. (b) Show that if nn is much larger than NN (think, for example, of n=106n = 10^6, N=10N = 10), then both the Bose-Einstein and the Fermi-Dirac results in part (a) contain products of NN numbers, each number approximately equal to nn. Thus show that for n≫Nn \gg N, both the BE and the FD results are approximately equal to nN/N!n^N/N!, which is 1/N!1/N! times the MB result.

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