%0 Journal Article
%T On second order periodic boundary-value problems with upper and lower solutions in the reversed order
%A Haiyin Gao
%A Shiyou Weng
%A Daqing Jiang
%A Xuezhang Hou
%J Electronic Journal of Differential Equations
%D 2006
%I Texas State University
%X In this paper, we study the differential equation with the periodic boundary value $$displaylines{ u''(t)=f(t, u(t), u'(t)),quad tin [0, 2pi]cr u(0)=u(2pi), quad u'(0)=u'(2pi). }$$ The existence of solutions to the periodic boundary problem above with appropriate conditions is proved by using an upper and lower solution method.
%K Periodic boundary value
%K existence
%K upper and lower solutions.
%U http://ejde.math.txstate.edu/Volumes/2006/25/abstr.html