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user 101078
For questions about the algebraic concept of 'character': a function from a group into a field satisfying certain properties. Not to be confused with the more commonly known psychological term.
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votes
Direct proof of a character sum identity
Next, let $\chi_{0,3}$ and $\chi_{0,6}$ be the principal characters $\mod 3$ and $6$. … One more simple observation is that due to the functional equation $L(0,\chi)=0$ for even characters, hence etiher $A$ or $B$ is always $0$.
P.S. …
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