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## Main Question or Discussion Point

given a partition function of the form

[tex] Z

[tex] Z

__= \prod Z_{i}____[/tex]__

[tex] Z_{i}[tex] Z_{i}

__= \sum_{n=-\infty}^{\infty}e^{iuE_{n}^{i}} [/tex]__

what is the meaning of zeros ? i mean the values that make Zwhat is the meaning of zeros ? i mean the values that make Z

__=0 and how could we calculate these zeros ??__