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- W2393335654 abstract "We are concerned with the problem of real analytic regularity of the solutions of sums of squares with real analytic coefficients. Treves conjecture states that an operator of this type is analytic hypoelliptic if and only if all the strata in the Poisson–Treves stratification are symplectic. We produce a model operator, P1, having a single symplectic stratum and prove that it is Gevrey s0 hypoelliptic and not better. See Theorem 2.1 for a definition of s0. We also show that this phenomenon has a microlocal character. We point out explicitly that this is a counterexample to the sufficient part of Treves conjecture and not to the necessary part, which is still an open problem." @default.
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- W2393335654 date "2018-05-01" @default.
- W2393335654 modified "2023-10-17" @default.
- W2393335654 title "Analytic hypoellipticity for sums of squares and the Treves conjecture" @default.
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- W2393335654 doi "https://doi.org/10.1016/j.jfa.2018.03.009" @default.
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