تفاصيل الرسالة العلمية

In this thesis, we will study some new systems ,which are two dimensional and depend on the last two terms .They are coupled. We take the four initial values in general with one vanishing term in order to simplify the calculations and reach an explicit form of the solution or the estimation. We have a parameter r, which is a fixed real number. We compute the form of the general solution for the previous system for the case r =1 and sometimes for r ?1. We give some brief summary about the incomplete gamma function, the gamma function