Algebro-analytical study on special functions appeared in number theory

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First I tried to make correspondence, via Mellin transforms and inverse Mellin transforms, between linear relations held among multiple zeta values and connection relations held among multiple polylogarithms of one variable. I was succeeded in clarifying the correspondence between Ohno relations for multiple zeta values and the connection formula for multiple polylogarithms with respect to z→z-1. This result was published as the paper "Relations for Multiple Zeta Values and Mellin Transforms of Multiple Polylogarithms, Publ. RIMS, Kyoto Univ. 40 (2004), 537-564".Motivated by this research, I tried to study symmetry of the formal Knizhinik-Zamolodchikov(KZ) equation of one variable, in which the coefficients of the equation are regarded as noncommutative variables. Here the symmetry of the equation means transformation theory of fundamental solutions normalized at the singular points. The most universal generating function of multiple polylogarithms is a fundamental solution normalized … More at z=0. The connection matrices of these fundamental solutions are given by the so called Drinfeld associator, and the connection relations yield the duality relation and the hexagon relation for the Drinfeld associator. This result was published as the paper "The Sum Formula of Multiple Zeta Values and Connection Problem of the Formal Knizhinik-Zamolodchikov Equation, Development in Mathematics 14, Zeta Functions, Topology and Quantum Physics ed. Be T. Aoki et al., Springer (2005),145-170.Furthermore, I have been trying to generalize the symmetry theory in the formal KZ equation of many variables. I expect that, from this theory, the connection formulas for multiple polylogarithms of many variables. So far, I established the decomposition theorem, and the analycity theorem for normalized fundamental solutions of the KZ equation, from which one can deduce the pentagon relation for the Drinfeld associator. I proposed a conjecture that the harmonic product relations(or the series shuffle relations) of multiple polylogarithms are equivalent to the decomposition theorem. This result is announced in an invited project lecture in the autumn conference of MSJ at Osaka City University, 2006 September. Less