Cemil Tunç
Department of Mathematics,
Faculty of Arts and Sciences
Yüzüncü Yıl University,
65080, Van -Turkey
İnan Çinar
Department of Mathematics,
Faculty of Arts and Sciences
Yüzüncü Yıl University,
65080, Van -Turkey
In this paper, we are concerned with the existence of periodic solutions to second order nonlinear differential equations of the form
By using Leary-Schauder principle, we establish some new sufficient conditions which insure that this equation has a periodic solution.