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In this paper, we present new techniques for solving a large variety ofpartial differential equations. The proposed method reduces the PDEs to firstorder differential equations known as classical equations such as Bernoulli,Ricatti and Abel equations. The main idea is based on implementing newtechniques by combining variations of parameters with characteristic methods toobtain many new and general exact solutions. In each class of PDE's, we giveillustrated examples. Moreover, the method presented in this paper can beeasily extended to classes of second order nonlinear PDEs.

Classes of second order nonlinear partial differential equations reducible to first order