A fast and precise method to solve the Altarelli-Parisi equations in x space

Abstract

A numerical method to solve linear integro-differential equations is presented. This method has been used to solve the QCD Altarelli-Parisi evolution equations within the H1 Collaboration at DESY-Hamburg. Mathematical aspects and numerical approximations are described. The precision of the method is discussed.

Comments: 18 pages, 4 figures