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- W4288363732 abstract "In his seminal 1934 paper on Brownian motion and the theory of gases Kolmogorov introduced a second order evolution equation which displays some challenging features. In the opening of his 1967 hypoellipticity paper Hormander discussed a general class of degenerate Ornstein-Uhlenbeck operators that includes Kolmogorov's as a special case. In this note we combine semigroup theory with a nonlocal calculus for these hypoelliptic operators to establish new inequalities of Hardy-Littlewood-Sobolev type in the situation when the drift matrix has nonnegative trace. Our work has been influenced by ideas of E. Stein and Varopoulos in the framework of symmetric semigroups. One of our objectives is to show that such ideas can be pushed to successfully handle the present degenerate non-symmetric setting." @default.
- W4288363732 created "2022-07-29" @default.
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- W4288363732 date "2019-04-29" @default.
- W4288363732 modified "2023-09-29" @default.
- W4288363732 title "Hardy-Littlewood-Sobolev inequalities for a class of non-symmetric and non-doubling hypoelliptic semigroups" @default.
- W4288363732 doi "https://doi.org/10.48550/arxiv.1904.12982" @default.
- W4288363732 hasPublicationYear "2019" @default.
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