Abstract
In this paper, we describe a systematic development of the different types of pertur- bations methods in the theory of differential and integral equations. A special quadratic pertur- bation of the periodic boundary value problems of second order ordinary differential equations is studied in detail for different aspects of the solutions. An existence theorem is proved under mixed generalized Lipschitz and Caratheodory conditions and the existence results for extremal positive solutions are established for Caratheodory as well as discontinuity conditions. Our re- sults include some known existence results for periodic boundary value problems of second order ordinary nonlinear differential equations as special cases.
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