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Diagonals of Self-adjoint Operators with Finite Spectrum

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Bownik M., Jasper J.
Bulletin of the Polish Academy of Sciences. Mathematics
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2015
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tom 63
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nr 3
249-260
EN
Given a finite set X⊆ ℝ we characterize the diagonals of self-adjoint operators with spectrum X. Our result extends the Schur-Horn theorem from a finite-dimensional setting to an infinite-dimensional Hilbert space analogous to Kadison's theorem for orthogonal projections (2002) and the second author's result for operators with three-point spectrum (2013).
2
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Anisotropic classes of homogeneous pseudodifferential symbols

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Bényi Á., Bownik M.
Studia Mathematica
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2010
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tom 200
|
nr 1
41-66
EN
We define homogeneous classes of x-dependent anisotropic symbols $Ṡ^{m}_{γ,δ}(A)$ in the framework determined by an expansive dilation A, thus extending the existing theory for diagonal dilations. We revisit anisotropic analogues of Hörmander-Mikhlin multipliers introduced by Rivière [Ark. Mat. 9 (1971)] and provide direct proofs of their boundedness on Lebesgue and Hardy spaces by making use of the well-established Calderón-Zygmund theory on spaces of homogeneous type. We then show that x-dependent symbols in $Ṡ⁰_{1,1}(A)$ yield Calderón-Zygmund kernels, yet their L² boundedness fails. Finally, we prove boundedness results for the class $Ṡ^m_{1,1}(A)$ on weighted anisotropic Besov and Triebel-Lizorkin spaces extending isotropic results of Grafakos and Torres [Michigan Math. J. 46 (1999)].
3
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Biorthogonal wavelets, MRA's and shift-invariant spaces

100%
Bownik M., Garrigós G.
Studia Mathematica
|
2004
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tom 160
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nr 3
231-248
EN
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].
4
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Affine frames, GMRA's, and the canonical dual

100%
Bownik M., Weber E.
Studia Mathematica
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2003
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tom 159
|
nr 3
453-479
EN
We show that if the canonical dual of an affine frame has the affine structure, with the same number of generators, then the core subspace V₀ is shift invariant. We demonstrate, however, that the converse is not true. We apply our results in the setting of oversampling affine frames, as well as in computing the period of a Riesz wavelet, answering in the affirmative a conjecture of Daubechies and Han. Additionally, we completely characterize when the canonical dual of a quasi-affine frame has the quasi-affine structure.
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