A lot of problems of the physical world can be modeled by nonlinear ordinary
differential equations with their initial and boundary conditions.
Especially higher order differential equations play a vital role in this
process. The method for solution and its effectiveness are as important as
the modeling. In this paper, on the basis of reproducing kernel theory, the
reproducing kernel functions have been obtained for solving some nonlinear
higher order differential equations. Additionally, for each problem the
homogenizing transforms have been obtained.