Semigroup commutators under differences.

Nicholas Th. Varopoulos

Displaying similar documents to “Semigroup commutators under differences.”

Semigroup commutators under differences (II).

Nicholas Th. Varopoulos (1993)

Revista Matemática Iberoamericana

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This is the second instalment of my previous paper with the same title, [1]. This paper consists of two different parts. The first part is devoted to improvements of the results developed in [1]. These improvements are described in section 0.1 below and developed in sections 1 to 5, and 9 to 10; they are in fact technically distinct from [1] and rely on a systematic use of microlocalisation in the context of Hörmander-Weyl calculus. These paragraphs can therefore be read quite independently...

Hölder estimates and hypoellipticity

André Unterberger, Julianne Unterberger (1976)

Annales de l'institut Fourier

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The aim of this paper is to show how, in order to prove regularity theorems, Hölder estimates, i.e. estimates involving products of powers of different semi-norms, can be used as well as standard estimates, and may in some instances be casier to prove.

Pseudo differential operators with negative definite symbols of variable order.

Walter Hoh (2000)

Revista Matemática Iberoamericana

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One way to represent the generator of a Markov process is given by pseudo differential operators. Above all this is due to the fact that the generator satisfies the so-called positive maximum principle (...).

On products of non-commuting sectorial operators

Frank Weber (1998)

Annali della Scuola Normale Superiore di Pisa - Classe di Scienze

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$L^{p}$ and Hölder estimates for pseudodifferential operators : sufficient conditions

Richard Beals (1979)

Annales de l'institut Fourier

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Continuity in $L^{p}$ spaces and spaces of Hölder type is proved for pseudodifferential operators of order zero, under general conditions on the class of symbols. Applications to the regularity theory of some hypoelliptic operators are outlined.

Boundedness in dilation theory

F. Szafraniec (1982)

Banach Center Publications

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L estimates for degenerate elliptic equations.

Antonio Sánchez-Calle (1988)

Revista Matemática Iberoamericana

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In this note we are going to address the question of when a second order differential operator is controlled by a subelliptic second order differential operator.

Displaying similar documents to “Semigroup commutators under differences.”