Answer by user200143 for A tricky derivation accompanied by delta function
He is showing the symmetry properties. You need to look at the fullequation; it is not a property of the delta function. The relevantpart is the sum\begin{eqnarray}S &=&\sum_{n,m} e^{-\beta...
View ArticleA tricky derivation accompanied by delta function
I have been reading a book on Thermal Field theory by Michel Le Bellac During the reading I have come into a seemingly trivial but indeed tricky derivation. On page 26(2.47), we are supposed too...
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