### Non-abelian unipotent periods Monodromy of iterated integrals, by Zdzislaw Wojtkowiak

We define and study non-abelian unipotent periods for algebraic
varieties. Their calculations reduce to calculations of the monodromy
of iterated integrals on algebraic varieties. We study the monodromy
with some details on pointed projective lines and on configuration spaces.
We give a new proof of Drinfeld-Ihara 5-cycle relation. We have also
some necessary and sufficient conditions (unfortunately almost tautological)
that the values of the Riemann zeta function at odd integers are irrational.

Zdzislaw Wojtkowiak <wojtkow@math.unice.fr>