Abstract
This article studies the global hypoellipticity of a class of overdetermined systems of pseudo-differential operators defined on the torus. The main goal consists in establishing connections between the global hypoellipticity of the system and the global hypoellipticity of its normal form. It is proved that an obstruction of number-theoretical nature appears as a necessary condition to the global hypoellipticity. Conversely, the sufficiency is approached by analyzing three types of hypotheses: a Hörmander condition, logarithmic growth and super-logarithmic growth.
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de Ávila Silva, F., de Medeira, C. Global hypoellipticity for a class of overdetermined systems of pseudo-differential operators on the torus. Annali di Matematica 200, 2535–2560 (2021). https://doi.org/10.1007/s10231-021-01090-w
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DOI: https://doi.org/10.1007/s10231-021-01090-w
Keywords
- Global hypoellipticity
- Pseudo-differential operators
- Overdetermined Systems
- Liouville vectors
- Fourier series