On the theory of entropy suband supersolutions of nonlinear degenerate parabolic equations
- Authors: Panov E.Y.1,2
-
Affiliations:
- Yaroslav-the-Wise Novgorod State University
- Scientific Research and Development Center
- Issue: Vol 69, No 2 (2023): Proceedings of the Crimean Autumn Mathematical School-Symposium
- Pages: 306-331
- Section: Articles
- URL: https://journals.rudn.ru/CMFD/article/view/35331
- DOI: https://doi.org/10.22363/2413-3639-2023-69-2-306-331
- EDN: https://elibrary.ru/UGEKXW
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Abstract
We consider a second-order nonlinear degenerate anisotropic parabolic equation in the case when the flux vector is only continuous and the nonnegative diffusion matrix is bounded and measurable. The concepts of entropy sub- and supersolution of the Cauchy problem are introduced, so that the entropy solution of this problem, understood in the sense of Chen-Perthame, is both an entropy sub- and supersolution. It is established that the maximum of entropy subsolutions of the Cauchy problem is also an entropy subsolution of this problem. This result is used to prove the existence of the largest entropy subsolution (and the smallest entropy supersolution). It is also shown that the largest entropy subsolution and the smallest entropy supersolution are also entropy solutions.
About the authors
E. Yu. Panov
Yaroslav-the-Wise Novgorod State University; Scientific Research and Development Center
Author for correspondence.
Email: eugeny.panov@novsu.ru
Novgorod the Great, Russia
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