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VISCOSITY SOLUTIONS TO THE INFINITY LAPLACIAN EQUATION WITH SINGULAR NONLINEAR TERMS

Part of: Partial differential equations Representations of solutions Elliptic equations and systems

Published online by Cambridge University Press:  20 March 2024

FANG LIU  and
HONG SUN
FANG LIU*
Affiliation:
Department of Mathematics, School of Mathematics and Statistics, Nanjing University of Science and Technology, Nanjing 210094, Jiangsu, PR China
HONG SUN
Affiliation:
Department of Mathematics, School of Mathematics and Statistics, Nanjing University of Science and Technology, Nanjing 210094, Jiangsu, PR China e-mail: sunhong3721@163.com
*
e-mail: sdqdlf78@126.com, liufang78@njust.edu.cn
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Abstract

In this paper, we study the singular boundary value problem

$$ \begin{align*} \begin{cases} \Delta_\infty^h u=\lambda f(x,u,Du) \quad &\mathrm{in}\; \Omega, \\ u>0\quad &\mathrm{in}\; \Omega,\\ u=0 \quad &\mathrm{on} \;\partial\Omega, \end{cases} \end{align*} $$

where $\lambda>0$ is a parameter, $h>1$ and $\Delta _\infty ^h u=|Du|^{h-3} \langle D^2uDu,Du \rangle $ is the highly degenerate and h-homogeneous operator related to the infinity Laplacian. The nonlinear term $f(x,t,p):\Omega \times (0,\infty )\times \mathbb {R}^{n}\rightarrow \mathbb {R}$ is a continuous function and may exhibit singularity at $t\rightarrow 0^{+}$. We establish the comparison principle by the double variables method for the general equation $\Delta _\infty ^h u=F(x,u,Du)$ under some conditions on the term $F(x,t,p)$. Then, we establish the existence of viscosity solutions to the singular boundary value problem in a bounded domain based on Perron’s method and the comparison principle. Finally, we obtain the existence result in the entire Euclidean space by the approximation procedure. In this procedure, we also establish the local Lipschitz continuity of the viscosity solution.

Keywords

infinity Laplaciansingular boundary value problemviscosity solutioncomparison principleexistence

MSC classification

Primary: 35D40: Viscosity solutions
Secondary: 35B51: Comparison principles 35J60: Nonlinear elliptic equations 35J70: Degenerate elliptic equations
Type
Research Article
Information
Journal of the Australian Mathematical Society , First View , pp. 1 - 30
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Copyright
© The Author(s), 2024. Published by Cambridge University Press on behalf of Australian Mathematical Publishing Association Inc.

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Footnotes

Communicated by Florica C. Cîrstea

This work was supported by the National Natural Science Foundation of China (No. 12141104)

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