On multiple Bernoulli

polynomials and multiple L-functions of root systems Yasushi Komori, Kohji Matsumoto and Hirofumi Tsumura We define generalized Bernoulli numbers, Bernoulli polynomials and multi-variable L-functions associated with root systems. We prove that the values of those L-functions at positive integers can be expressed in terms of those Bernoulli polynomials, and give an explicit formula for the latter. This result is a character analogue of Witten’s volume formula for Witten’s zeta-functions of semisimple Lie algebras. Furthermore, we show that the L-functions can be continued meromorphically to the whole space, and satisfy certain functional relations. 1