E. Ahmadi - Department of Mathematics, Shahr-e-Qods Branch, Islamic Azad University, Tehran, Iran
N. Ahmadi - Department of Mathematics, Varamin-Pishva Branch, Islamic Azad University, Varamin, Iran

In this paper a numerical method for solving forth order fuzzy dierentialequations under generalized differentiability is proposed. This method is basedon the interpolating a solution by piecewise polynomial of degree ۸ in the rangeof solution . We investigate the existence and uniqueness of solutions. Finally anumerical example is presented to illustrate the accuracy of the new technique.