Positivity sets of supersolutions of degenerate elliptic equations and the strong maximum principle
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- by Isabeau Birindelli, Giulio Galise and Hitoshi Ishii PDF
- Trans. Amer. Math. Soc. 374 (2021), 539-564 Request permission
Abstract:
We investigate positivity sets of nonnegative supersolutions of the fully nonlinear elliptic equations $F(x,u,Du,D^2u)=0$ in $\Omega$, where $\Omega$ is an open subset of $\mathbb {R}^N$, and the validity of the strong maximum principle for $F(x,u,Du,D^2u)=f$ in $\Omega$, with $f\in \mathrm {C}(\Omega )$ being nonpositive. We obtain geometric characterizations of positivity sets $\{x\in \Omega : u(x)>0\}$ of nonnegative supersolutions $u$ and establish the strong maximum principle under some geometric assumption on the set $\{x\in \Omega : f(x)=0\}$.References
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Additional Information
- Isabeau Birindelli
- Affiliation: Dipartimento di Matematica G. Castelnuovo, Sapienza Università di Roma, P.le Aldo Moro 2, I-00185 Roma, Italy
- MR Author ID: 325034
- Email: isabeau@mat.uniroma1.it
- Giulio Galise
- Affiliation: Dipartimento di Matematica G. Castelnuovo, Sapienza Università di Roma, P.le Aldo Moro 2, I-00185 Roma, Italy
- MR Author ID: 960152
- ORCID: 0000-0002-9708-5113
- Email: galise@mat.uniroma1.it
- Hitoshi Ishii
- Affiliation: Institute for Mathematics and Computer Science, Tsuda University, 2-1-1 Tsuda, Kodaira, Tokyo 187-8577, Japan
- MR Author ID: 189965
- ORCID: 0000-0002-3244-7929
- Email: hitoshi.ishii@waseda.jp
- Received by editor(s): December 22, 2019
- Received by editor(s) in revised form: May 12, 2020
- Published electronically: October 26, 2020
- Additional Notes: The work of the third author was partially supported by the JSPS grants: KAKENHI #16H03948, #18H00833, #20K03688, #20H01817. The authors wish to thank the Sapienza University of Rome for funding the third author’s visit on May 6–June 5, 2019, during which this work was started. The third author thanks the Department of Mathematics, Guido Castelnuovo, for its hospitality
The third author is the corresponding author - © Copyright 2020 American Mathematical Society
- Journal: Trans. Amer. Math. Soc. 374 (2021), 539-564
- MSC (2010): Primary 35B05, 35B50, 35D40, 35J60, 35J70, 49L25
- DOI: https://doi.org/10.1090/tran/8226
- MathSciNet review: 4188192