Evaluating Multiple Polylogarithm Values at Sixth Roots of Unity up to Weight Six

Abstract

We evaluate multiple polylogarithm values at sixth roots of unity up to weight six, i.e. of the form $G(a_1,\dots ,a_w;1)$ where the indices $a_i$ are equal to zero or a sixth root of unity, with $a_1\ne 1$. For $w\le 6$, we present bases of the linear spaces generated by the real and imaginary parts of $G(a_1,\dots ,a_w;1)$ and present a table for expressing them as linear combinations of the elements of the bases.

Comments: 15 pages, exposition improved, to appear in Nuclear Physics B