Local Real Analyticity of Solutions for sums of squares of non-linear vector fields

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We show that all smooth solutions of model non-linear sums of squares of vector fields are locally real analytic. A global result for more general operators is presented in a paper by Makhlouf Derridj and the first author under the title "Global Analytic Hypoellipticity for a Class of Quasilinear Sums of Squares of Vector Fields".
AMS-LaTeX, 10 pp

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Analysis of PDEs, 35B65

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http://salesiana.dossiersoluciones.com/handle/123456789/99072

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/math/0303032
 http://arxiv.org/abs/math/0303032
 Journal of Differential Equations {\bf 213} (2) (2005), pp.~341-351.

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