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- W68656478 abstract "We prove analytic hypoellipticity for a sum of squares of vector fields in ℝ3 all of whose Poisson strata are equal and symplectic of codimension four, extending in a model setting the recent general result of Cordaro and Hanges in codimension two [2]. The easy model we study first and then its easy generalizations possess a divisibility property reminiscent of earlier work of the author and Derridj in [3] and Grigis–Sjöstrand in [4]." @default.
- W68656478 created "2016-06-24" @default.
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- W68656478 date "2009-01-01" @default.
- W68656478 modified "2023-09-23" @default.
- W68656478 title "Analytic Hypoellipticity for a Sum of Squares of Vector Fields in ℝ3 Whose Poisson Stratification Consists of a Single Symplectic Stratum of Codimension Four" @default.
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- W68656478 doi "https://doi.org/10.1007/978-0-8176-4861-9_15" @default.
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