Supported by the National Natural Science Foundation of China(10061004); Supported by the Natural Sciences Foundation of Yunnan province(2003A0001M)
By using some differential inequality, a second-order delay differential equation(r(t)x′(t))′ + p(t)x(q(t)) = 0has been investigated and some necessary condition for this equation has a nonoscillatorysolution and so...
Supported by the National Natural Sciences Foundation of China( 1 0 0 61 0 0 4 ) and the Natural SciencesFoundation of Yunnan Province
By using the Krasnoselskii's fixed point theorem for cones,conditions for the existence of positive solutions to the three-point boundary value problem for second order differential equation with an advanced argumentu...