Some nonanalytic-hypoelliptic sums of squares of vector fields
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- by Michael Christ PDF
- Bull. Amer. Math. Soc. 26 (1992), 137-140 Request permission
Abstract:
Certain second-order partial differential operators, which are expressed as sums of squares of real-analytic vector fields in ${\mathbb {R}^3}$ and which are well known to be ${C^\infty }$ hypoelliptic, fail to be analytic hypoelliptic.References
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Additional Information
- © Copyright 1992 American Mathematical Society
- Journal: Bull. Amer. Math. Soc. 26 (1992), 137-140
- MSC (2000): Primary 35H05
- DOI: https://doi.org/10.1090/S0273-0979-1992-00258-6
- MathSciNet review: 1110438