A Priori Bounds for Boundary Sets

Abstract
Consider <!-- MATH $y'' = f(t,y,y')$ --> with boundary conditions <!-- MATH $(0,y(0),y'(0)) \in {S_1},(1,y(1),y'(1)) \in {S_2}$ --> . It is shown that the boundary value problem has a solution for certain boundary sets and which depend on the assumed Nagumo condition for .

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