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Currently displaying 1 – 4 of 4

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Generalized Hardy spaces on tube domains over cones

Gustavo Garrigos — 2001

Colloquium Mathematicae

We define a class of spaces H μ p , 0 < p < ∞, of holomorphic functions on the tube, with a norm of Hardy type: | | F | | H μ p p = s u p y Ω Ω ̅ | F ( x + i ( y + t ) ) | p d x d μ ( t ) . We allow μ to be any quasi-invariant measure with respect to a group acting simply transitively on the cone. We show the existence of boundary limits for functions in H μ p , and when p ≥ 1, characterize the boundary values as the functions in L μ p satisfying the tangential CR equations. A careful description of the measures μ when their supports lie on the boundary of the cone is also provided....

Poisson-like kernels in tube domains over light-cones

Gustavo Garrigós — 2002

Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti Lincei. Matematica e Applicazioni

A family of holomorphic function spaces can be defined with reproducing kernels B α z , w , obtained as real powers of the Cauchy-Szegö kernel. In this paper we study properties of the associated Poisson-like kernels: P α z , w = B α z , w 2 / B α z , z . In particular, we show boundedness of associated maximal operators, and obtain formulas for the limit of Poisson integrals in the topological boundary of the cone.

Connectivity, homotopy degree, and other properties of α-localized wavelets on R.

Gustavo Garrigós — 1999

Publicacions Matemàtiques

In this paper, we study general properties of α-localized wavelets and multiresolution analyses, when 1/2 &lt; α ≤ ∞. Related to the latter, we improve a well-known result of A. Cohen by showing that the correspondence m → φ' = Π m(2 ·), between low-pass filters in H(T) and Fourier transforms of α-localized scaling functions (in H(R)), is actually a homeomorphism of topological spaces. We also show that the space of such filters can be regarded as a connected infinite dimensional...

Biorthogonal wavelets, MRA's and shift-invariant spaces

Marcin BownikGustavo Garrigós — 2004

Studia Mathematica

We give a characterization of biorthogonal wavelets arising from MRA's of multiplicity D entirely in terms of the dimension function. This improves the previous characterization in [8] removing an unnecessary angle condition. Besides we characterize Riesz wavelets arising from MRA's, and present new proofs based on shift-invariant space theory, generalizing the 1-dimensional results appearing in [17].

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