Erratum: A Parabolic Quasilinear Problem for Linear Growth Functionals.
F. Andreu, V. Caselles, J. M. Mazón (2008)
Revista Matemática Iberoamericana
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F. Andreu, V. Caselles, J. M. Mazón (2008)
Revista Matemática Iberoamericana
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Lidia Maniccia, Marco Mughetti (2006)
Revista Matemática Iberoamericana
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We prove Fefferman's SAK Principle for a class of hypoelliptic operators on R whose nonnegative symbol vanishes anisotropically on the characteristic manifold.
Vakhtang Kokilashvili, Stefan Samko (2004)
Revista Matemática Iberoamericana
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Karlheinz Gröchenig (2006)
Revista Matemática Iberoamericana
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We investigate the properties an exotic symbol class of pseudodifferential operators, Sjöstrand's class, with methods of time-frequency analysis (phase space analysis). Compared to the classical treatment, the time-frequency approach leads to striklingly simple proofs of Sjöstrand's fundamental results and to far-reaching generalizations.
Sönke Blunck, Peer Christian Kunstmann (2003)
Revista Matemática Iberoamericana
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Gérard Bourdaud, Massimo Lanza de Cristoforis, Winfried Sickel (2006)
Revista Matemática Iberoamericana
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We characterize the set of all functions f of R to itself such that the associated superposition operator T: g → f º g maps the class BV (R) into itself. Here BV (R), 1 ≤ p < ∞, denotes the set of primitives of functions of bounded p-variation, endowed with a suitable norm. It turns out that such an operator is always bounded and sublinear. Also, consequences for the boundedness of superposition operators defined on Besov spaces B ...
F. Bayart (2008)
Revista Matemática Iberoamericana
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F. Broglia, F. Pieroni (2009)
Revista Matemática Iberoamericana
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Camil Muscalu, Jill Pipher, Terence Tao, Christoph Thiele (2006)
Revista Matemática Iberoamericana
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We prove that classical Coifman-Meyer theorem holds on any polidisc T or arbitrary dimension d ≥ 1.