Factorization of Coefficients for Exponential and Logarithm in Function Fields

Abstract

Let $X$ be an elliptic curve or a ramifying hyperelliptic curve over ${\mathbb{F}}_q$. We will discuss how to factorize the coefficients of the exponential and logarithm series for a Hayes module over such a curve. This allows us to obtain $v$-adic convergence results for such exponential and logarithm series, for $v$ a 'finite' prime. As an application, we can show that the $v$-adic Goss $L$-value $L_v(1,\Psi )$ is log-algebraic for suitable characters $\Psi$.

32 pages