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On the existence of positive solutions to a certain class of semilinear elliptic equations

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Abstract

In this paper, we study the following semilinear elliptic equation

$$\begin{aligned} \Delta u = \varphi \left( V(x) u - f(x,u(x)) \right) \quad \text {in} \,\, \mathbf {R}^N, \quad u \in H^1( \mathbf {R}^N ) \end{aligned}$$

where \(N \ge 1\) and \(\varphi (s)\), V(x), f(xs) are given functions. Under some conditions on \(\varphi (s), V(x), f(x,s)\), we show the existence of positive solution. In particular, we extend the result of Felmer and Ikoma (J Funct Anal 275(8):2162–2196, 2018). In Felmer and Ikoma (J Funct Anal 275(8):2162–2196, 2018), the existence of positive solution was proved by topological degree theoretic argument. In this paper, we employ the variational method.

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Acknowledgements

The author would like to thank Lawrence Craig Evans for pointing out the variational structure of (1.3) to him. He also would like to thank Hitoshi Ishii for helpful comments on the consideration of (1.3). The author was supported by JSPS KAKENHI Grant Numbers JP 17H02851, 19H01797 and 19K03590.

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Correspondence to Norihisa Ikoma.

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This article is part of the section "Viscosity solutions - Dedicated to Hitoshi Ishii on the award of the 1st Kodaira Kunihiko Prize" edited by Kazuhiro Ishige, Shigeaki Koike, Tohru Ozawa, Senjo Shimizu.

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Ikoma, N. On the existence of positive solutions to a certain class of semilinear elliptic equations. Partial Differ. Equ. Appl. 2, 28 (2021). https://doi.org/10.1007/s42985-021-00079-7

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