# Martin Cech

Concordia University

### A double sum of Jacobi symbols and multiple Dirichlet series

Linfoot Number Theory Seminar
26th May 2021, 11:00 am – 12:00 pm
Fry Building, Online

We will study the double sum of Jacobi symbols
\sum_{n\leq X}\sum_{m\leq Y}\left(\frac{m}{n}\right).
This sum was studied by Conrey, Farmer, and Soundararajan, who gave a surprising asymptotic formula. We will show how to obtain the same asymptotic with an improved error term by transforming the double sum into a double integral that involves a double Dirichlet series, and study the analytic properties of the double Dirichlet series.