Polylogarithms in Arithmetic and Geometry

نویسنده

A. B. GONCHAROV

چکیده

After a century of neglect the dilogarithm appeared twenty years ago in works of Gabrielov-Gelfand-Losik [GGL] on a combinatorial formula for the first Pontryagin class, Bloch on K-theory and regulators [Bl1] and Wigner on Lie groups. The dilogarithm has a single-valued cousin : the Bloch Wigner function L2(z) := ImLi2(z) + arg(1− z) log |z|. Let r(x1, ..., x4) be the cross-ratio of 4 distinct points on CP . Then

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