‎multistep collocation method for nonlinear delay integral equations

The main purpose of this paper is to study the numerical solution of nonlinear volterra integral equations with constant delays, based on the multistep collocation method. these methods for approximating the solution in each subinterval are obtained by fixed number of previous steps and fixed number of collocation points in current and next subintervals. also, we analyze the convergence of the multistep collocation method when used to approximate smooth solutions of delay integral equations. finally, numerical results are given showing a marked improvement in comparison with exact solution.