Abstract

The existence, uniqueness and multiplicity of positive solutions of the following boundary value problem is considered: u (4)(t)−λf(t,u(t))=0, for 0<t<1,u(0)=u(1)=u″(0)=u″(1)=0, where λ>0 is a constant, f :[0,1]×[0,+∞)→[0,+∞) is continuous.

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