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I've got a problem. If you scroll down to page 118 on the following link

http://books.google.com/books?id=nt...X&oi=book_result&resnum=4&ct=result#PPA118,M1

there you will find an expansion (eq. 10.27) of the partition function [tex]Z_{\pi}[/tex], but I don't know how this expansion is explicity being done. Could anyone help me, please?

As described on page 116 I think the sum was replaced by an integral ([tex] \Omega [/tex] denotes the volume). But I still don't know how to get rid of the logarithm and the exponential function.

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# Partition function expansion

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