Multiple zeta values and zeta-functions of root systems

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We propose the viewpoint that the r-ple zeta-function of Euler-Zagier type can be regarded as a specialization of the zeta-function associated with the root system of Cr type. From this viewpoint, we can see that Zagier’s well-known formula for multiple zeta values (MZVs) coincides with Witten’s volume formula associated with a sub-root system of Cr type. Based on this observation, we generalize Zagier’s formula and also give analogous results which correspond to a sub-root system of Br type. We announce those results as well as some relevant results for partial multiple zeta values.

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