Linear disjointness and values of Mahler M-functions

Abstract

We prove that the algebra generated by the values of Mahler M-functions at algebraic points admits a decomposition as the tensor product, over Q, of a countable family of linearly disjoint algebras. Consequently, the study of linear and algebraic relations among such values reduces to the corresponding problem within each of these smaller algebras. Our proof relies on recent advances of the authors on Mahler's method in several variables. As an application, we obtain a complete description of the algebraic relations among the values of the Fredholm series and their derivatives at nonzero algebraic points. This fully resolves an old problem originating in Mahler's work.