# FORTRAN program for a numerical solution of the nonsinglet Altarelli-Parisi equation

## Description

Abstract We investigate a numerical solution of the flavor-nonsinglet Altarelli-Parisi equation with next-to-leading-order α_scorrections by using Laguerre polynomials. Expanding a structure function (or a quark distribution) and a splitting function by the Laguerre polynomials, we reduce an integrodifferential equation to a summation of finite number of Laguerre coefficients. We provide a FORTRAN program for Q^2evolution of nonsinglet structure functions (F_1 , F_2 , and F_3 ) and nonsinglet quar... Title of program: LAG2NS Catalogue Id: ADAV_v1_0 Nature of problem This program solves the Altarelli-Parisi equation for a spin-independent flavour-nonsinglet structure function or quark distribution. Versions of this program held in the CPC repository in Mendeley Data ADAV_v1_0; LAG2NS; 10.1016/0010-4655(94)00159-Y This program has been imported from the CPC Program Library held at Queen's University Belfast (1969-2019)