In this note, we establish the exact multiplicity result for a second-order Neumann boundary value problem {u ''(t) + f(u(t)) = h(t), 0 <= t <= 1, u'(0) = u'(1) = 0. where f is singular at zero. Wirtinger inequality, comparison theorem, maximum principle and lower and upper solutions method are employed to prove the main theorem.
机构:
Department of Mathematics, Qufu Normal University, Qufu
Department of Fundamental Courses, Hangzhou Radio and TV UniversityDepartment of Mathematics, Qufu Normal University, Qufu