FERAHTIA, Rahima2019-07-082019-07-082019http://dspace.univ-msila.dz:8080//xmlui/handle/123456789/14688In this work, we solve initial value problem for a two first order numerically using Taylor series. On the other hand, we show that after the transformation of the (IVP) into Volterra integral equation of the second kind, its numerical solution using modified Simpson method are better than Taylor method.enTaylor et méthode.problème initialeThesis