Counterexamples for classical operators on Lorentz-Zygmund spaces
Robert Sharpley (1980)
Studia Mathematica
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Robert Sharpley (1980)
Studia Mathematica
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C. Calderón, J. Lewis (1976)
Studia Mathematica
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D. Burkholder, R. Gundy (1972)
Studia Mathematica
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S. Kisliakov (1995)
Studia Mathematica
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Under certain conditions on a function space X, it is proved that for every -function f with one can find a function φ, 0 ≤ φ ≤ 1, such that φf ∈ X, and . For X one can take, e.g., the space of functions with uniformly bounded Fourier sums, or the space of -functions on whose convolutions with a fixed finite collection of Calderón-Zygmund kernels are also bounded.
Richard Beals (1979)
Annales de l'institut Fourier
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Continuity in 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.
Francesc Tugores (1992)
Publicacions Matemàtiques
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We construct a defining function for a convex domain in C that we use to prove that the solution-operator of Henkin-Romanov for the ∂-equation is bounded in L and L-norms with a weight that reflects not only how near the point is to the boundary of the domain but also how convex the domain is near the point. We refine and localize the weights that Polking uses in [Po] for the same type of domains because they depend only on the Euclidean distance to the boudary and don't take into account...
Vladislav A. Panferov (2004)
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze
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The Povzner equation is a version of the nonlinear Boltzmann equation, in which the collision operator is mollified in the space variable. The existence of stationary solutions in is established for a class of stationary boundary-value problems in bounded domains with smooth boundaries, without convexity assumptions. The results are obtained for a general type of collision kernels with angular cutoff. Boundary conditions of the diffuse reflection type, as well as the given incoming...
Bernardo López Melero (1982)
Studia Mathematica
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Lennart Carleson, Per Sjölin (1972)
Studia Mathematica
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