A NONLINEAR TWO-POINT BOUNDARY VALUE PROBLEM AT RESONANCE

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In this letter,we study the semilinear two-point boundary value problem u〃(x)+u(x)+g(x,u(x))=h(x),U(0)=u(π)=0 ,where h∈L~2(0,π) and g: (0, π)×R→R are a Caratheodary function. Recently, this problem was studied by several authors under some conditions
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