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Author Xiong, Xiao, 1989- author.

Title Sobolev, Besov and Triebel-Lizorkin spaces on quantum tori / Xiao Xiong, Quanhua Xu, Zhi Yin
Published Providence, RI : American Mathematical Society, [2018]
©2018

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Description 1 online resource (vi, 118 pages)
Series Memoirs of the American Mathematical Society, 0065-9266 ; volume 252, number 1203
Memoirs of the American Mathematical Society ; no. 1203.
Contents Preliminaries -- Sobolev spaces -- Besov spaces -- Triebel-Lizorkin spaces -- Interpolation -- Embedding -- Fourier multiplier
Summary "This paper gives a systematic study of Sobolev, Besov and Triebel-Lizorkin spaces on a noncommutative -torus (with a skew symmetric real -matrix). These spaces share many properties with their classical counterparts. We prove, among other basic properties, the lifting theorem for all these spaces and a Poincaré type inequality for Sobolev spaces. We also show that the Sobolev space coincides with the Lipschitz space of order, already studied by Weaver in the case . We establish the embedding inequalities of all these spaces, including the Besov and Sobolev embedding theorems. We obtain Littlewood-Paley type characterizations for Besov and Triebel-Lizorkin spaces in a general way, as well as the concrete ones in terms of the Poisson, heat semigroups and differences. Some of them are new even in the commutative case, for instance, our Poisson semigroup characterizations improve the classical ones. As a consequence of the characterization of the Besov spaces by differences, we extend to the quantum setting the recent results of Bourgain-Brézis -Mironescu and Maz'ya-Shaposhnikova on the limits of Besov norms. The same characterization implies that the Besov space for is the quantum analogue of the usual Zygmund class of order . We investigate the interpolation of all these spaces, in particular, determine explicitly the K-functional of the couple, which is the quantum analogue of a classical result due to Johnen and Scherer. Finally, we show that the completely bounded Fourier multipliers on all these spaces do not depend on the matrix, so coincide with those on the corresponding spaces on the usual -torus. We also give a quite simple description of (completely) bounded Fourier multipliers on the Besov spaces in terms of their behavior on the -components in the Littlewood-Paley decomposition."--Page v
Notes "March 2018, volume 252, number 1203 (fourth of 6 numbers)."
Keywords: Quantum tori, noncommutative Lp-spaces, Bessel and Riesz potentials, (potential) Sobolev spaces, Besov spaces, Triebel-Lizorkin spaces, Hardy spaces, characterizations, Poisson and heat semigroups, embedding inequalities, interpolation, (completely) bounded Fourier multipliers
Bibliography Includes bibliographical references (pages 115-118)
Notes Description from online resource (viewed 13 April 2018)
Subject Sobolev spaces.
Besov spaces.
Function spaces.
Lipschitz spaces.
Torus (Geometry)
MATHEMATICS -- Calculus.
MATHEMATICS -- Mathematical Analysis.
Variedades algebraicas
Besov spaces
Function spaces
Lipschitz spaces
Sobolev spaces
Torus (Geometry)
Form Electronic book
Author Xu, Quanhua, author.
Yin, Zhi, 1984- author.
American Mathematical Society, publisher
ISBN 1470443759
9781470443757