Abstract
Here we shall discuss analyticity results for several important partial differential equations. This includes the analytic regularity of sub-Laplacians under the finite type condition; the analyticity of the solution in both variables to the Cauchy problem for the Camassa–Holm equation with analytic initial data by using the Ovsyannikov theorem, which is a Cauchy–Kowalevski type theorem for nonlocal equations; the Cauchy problem for BBM with analytic initial data; the Cauchy problem for KdV with analytic initial data examining the evolution of uniform radius of spatial analyticity; and finally the time regularity of KdV solutions, which is Gevrey 3.
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Acknowledgements
The first author was partially supported by a grant from the Simons Foundation (#524469 to Alex Himonas). The second author was partially supported by Conselho Nacional de Desenvolvimento Científico e Tecnológico—CNPq, Grant 303111/2015-1 and São Paulo Research Foundation (FAPESP), Grant 2018/14316-3. Also, the authors thank the referee for constructive suggestions.
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In memory of Nick Hanges.
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Himonas, A.A., Petronilho, G. Analyticity in partial differential equations. Complex Anal Synerg 6, 15 (2020). https://doi.org/10.1007/s40627-020-00052-x
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DOI: https://doi.org/10.1007/s40627-020-00052-x
Keywords
- Analyticity
- Analytic hypoellipticity of sub-Laplacians
- Cauchy problem with analytic data
- Ovsyannikov theorem
- Camassa–Holm equation
- Benjamin–Bona–Mahony equation
- Korteweg–de Vries equation
- Approximate conservation law
- Uniform radius of spatial analyticity