The Eisenstein cocycle, partial zeta values and Gross--Stark units

preprint2014arXivOpen access

Abstract

We introduce an integral version of the Eisenstein cocycle. As applications we prove a conjecture of Gross regarding the "order of vanishing" of Stickelberger elements relative to an abelian tower of fields and give a cohomological construction of the conjectural Gross--Stark units.

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