Geodesic
An existence theorem of positive solutions to a singular nonlinear boundary value problem
Commentationes Mathematicae Universitatis Carolinae, Tome 36 (1995) no. 4, pp. 609-614.

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In this note we consider the boundary value problem $y''=f(x,y,y')$ $\,(x\in [0,X];X>0)$, $y(0)=0$, $y(X)=a>0$; where $f$ is a real function which may be singular at $y=0$. We prove an existence theorem of positive solutions to the previous problem, under different hypotheses of Theorem 2 of L.E. Bobisud [J. Math. Anal. Appl. 173 (1993), 69–83], that extends and improves Theorem 3.2 of D. O'Regan [J. Differential Equations 84 (1990), 228–251].
Classification : 34B15
Keywords: ordinary differential equations; singular boundary value problem; positive solutions 
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Bonanno, Gabriele. An existence theorem of positive solutions to a singular nonlinear boundary value problem. Commentationes Mathematicae Universitatis Carolinae, Tome 36 (1995) no. 4, pp. 609-614. http://geodesic.mathdoc.fr/item/CMUC_1995__36_4_a0/