Title: Noncommutative modular symbols and Eisenstein series,
Abstract: We form real-analytic Eisenstein series twisted by Manin's noncommutative
modular symbols. After developing their basic properties, these series are
shown to have meromorphic continuations to the entire complex plane and satisfy
functional equations in some cases. This theory neatly contains and generalizes
earlier work in the literature on the properties of Eisenstein series twisted
by classical modular symbols.