Bobisud, L. E.
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Bobisud, L. E. O'Regan, Donal (1996). . Proceedings of the American Mathematical Society 124 (7), 2081-2087
We prove the existence of nonnegative solutions of the problem (py')'/p + mu qg(x, y) = 0, lim(x-->0+)py' = 0, h(y'(1)) + y(1) = 0 for a physically motivated class of nonlinearity h. The results, which are established using a ''forbidden value'' argument, are new even in the case of linear h.