Size properties of wavelet packets generated using finite filters.
Morten Nielsen (2002)
Revista Matemática Iberoamericana
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Morten Nielsen (2002)
Revista Matemática Iberoamericana
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Shinya Moritoh, Tomomi Yamada (2004)
Revista Matemática Iberoamericana
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María J. Carro, Joaquim Martín (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.
Zoltán Buczolich (2005)
Revista Matemática Iberoamericana
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In this paper we give a complete answer to the famous gradient problem of C. E. Weil. On an open set G ⊂ R we construct a differentiable function f: G → R for which there exists an open set Ω ⊂ R such that ∇f(p) ∈ Ω for a p ∈ G but ∇f(q) ∉ Ω for almost every q ∈ G. This shows that the Denjoy-Clarkson property does not hold in higher dimensions.
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.
Herbert Koch, Winfried Sickel (2002)
Revista Matemática Iberoamericana
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M. Fabian, P. Hájek, V. Montesinos, V. Zizler (2005)
Revista Matemática Iberoamericana
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A quantitative version of Krein's Theorem on convex hulls of weak compact sets is proved. Some applications to weakly compactly generated Banach spaces are given.
Giovanna Citti, Giuseppe Tomassini (2004)
Revista Matemática Iberoamericana
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J. Parcet (2007)
Revista Matemática Iberoamericana
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