Asymptotics of Multivariate Sequences, part I. Smooth points of the singular variety

R. Pemantle, M. C. Wilson

Published 2000-03-28Version 1

Given a multivariate generating function F, we determine asymptotics for the coefficients. Our approach is to use Cauchy's integral formula near singular points of F, resulting in a tractable oscillating integral. This paper treats the case where the singular point of F is a smooth point of a surface of poles. Companion papers will treat singular points of F where the local geometry is more complicated, and for which other methods of analysis are not known.