# American Institute of Mathematical Sciences

2015, 2015(special): 436-445. doi: 10.3934/proc.2015.0436

## Existence of positive solutions of a superlinear boundary value problem with indefinite weight

 1 SISSA - International School for Advanced Studies, via Bonomea 265, 34136 Trieste, Italy

Received  September 2014 Revised  September 2015 Published  November 2015

We deal with the existence of positive solutions for a two-point boundary value problem associated with the nonlinear second order equation $u''+a(x)g(u)=0$. The weight $a(x)$ is allowed to change sign. We assume that the function $g\colon\mathopen{[}0,+\infty\mathclose{[}\to\mathbb{R}$ is continuous, $g(0)=0$ and satisfies suitable growth conditions, including the superlinear case $g(s)=s^{p}$, with $p>1$. In particular we suppose that $g(s)/s$ is large near infinity, but we do not require that $g(s)$ is non-negative in a neighborhood of zero. Using a topological approach based on the Leray-Schauder degree we obtain a result of existence of at least a positive solution that improves previous existence theorems.
Citation: Guglielmo Feltrin. Existence of positive solutions of a superlinear boundary value problem with indefinite weight. Conference Publications, 2015, 2015 (special) : 436-445. doi: 10.3934/proc.2015.0436
##### References:
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##### References:
 [1] H. Amann and J. López-Gómez, A priori bounds and multiple solutions for superlinear indefinite elliptic problems,, J. Differential Equations, 146 (1998), 336.   Google Scholar [2] H. Berestycki, I. Capuzzo-Dolcetta and L. Nirenberg, Superlinear indefinite elliptic problems and nonlinear Liouville theorems,, Topol. Methods Nonlinear Anal., 4 (1994), 59.   Google Scholar [3] D. Bonheure, J. M. Gomes and P. Habets, Multiple positive solutions of superlinear elliptic problems with sign-changing weight,, J. Differential Equations, 214 (2005), 36.   Google Scholar [4] D. G. de Figueiredo, Positive solutions of semilinear elliptic problems,, in Differential equations (São Paulo, (1981), 34.   Google Scholar [5] L. H. Erbe and H. Wang, On the existence of positive solutions of ordinary differential equations,, Proc. Amer. Math. Soc., 120 (1994), 743.   Google Scholar [6] G. Feltrin and F. Zanolin, Multiple positive solutions for a superlinear problem: a topological approach,, J. Differential Equations, 259 (2015), 925.   Google Scholar [7] M. Gaudenzi, P. Habets and F. Zanolin, Positive solutions of superlinear boundary value problems with singular indefinite weight,, Commun. Pure Appl. Anal., 2 (2003), 411.   Google Scholar [8] K. Lan and J. R. L. Webb, Positive solutions of semilinear differential equations with singularities,, J. Differential Equations, 148 (1998), 407.   Google Scholar [9] R. Manásevich, F. I. Njoku and F. Zanolin, Positive solutions for the one-dimensional $p$-Laplacian,, Differential Integral Equations, 8 (1995), 213.   Google Scholar [10] R. D. Nussbaum, Periodic solutions of some nonlinear, autonomous functional differential equations. II,, J. Differential Equations, 14 (1973), 360.   Google Scholar [11] R. D. Nussbaum, Positive solutions of nonlinear elliptic boundary value problems,, J. Math. Anal. Appl., 51 (1975), 461.   Google Scholar [12] A. Zettl, Sturm-Liouville theory,, Mathematical Surveys and Monographs, (2005).   Google Scholar
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