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Self-similarity and Multiwavelets in Higher Dimensions (Memoirs of the American Mathematical Society)

Cabrelli, Carlos A.; Heil, Christopher; Molter, Ursula M.

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ISBN 10: 0821835203 / ISBN 13: 9780821835203
Published by Amer Mathematical Society
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Title: Self-similarity and Multiwavelets in Higher ...

Publisher: Amer Mathematical Society


Book Condition:Fine

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Let $A$ be a dilation matrix, an$n \times n$ expansive matrix that maps a full-rank lattice $\Gamma \subset \R^n$ into itself. Let $\Lambda$ be a finite subset of$\Gamma$, and for $k \in \Lambda$ let $c_k$ be $r \times r$ complex matrices. The refinement equation corresponding to $A$,$\Gamma$, $\Lambda$, and $c = \set{c_k}_{k \in \Lambda}$ is $f(x) = \sum_{k \in \Lambda} c_k \, f(Ax-k)$. A solution $f \colon \R^n \to \C^r$, if one exists, is called a refinable vector function or a vector scaling function of multiplicity $r$. In this manuscript we characterize the existence of compactly supported $L^p$ or continuous solutions of the refinement equation, in terms of the $p$-norm joint spectral radius of a finite set of finite matrices determined by the coefficients $c_k$.We obtain sufficient conditions for the $L^p$ convergence ($1 \le p \le \infty$) of the Cascade Algorithm $f^{(i+1)}(x) = \sum_{k \in \Lambda} c_k \, f^{(i)}(Ax-k)$, and necessary conditions for the uniform convergence of the Cascade Algorithm to a continuous solution. We also characterize those compactly supported vector scaling functions which give rise to a multiresolution analysis for $L^2(\R^n)$ of multiplicity $r$, and provide conditions under which there exist corresponding multiwavelets whose dilations and translations form an orthonormal basis for $L^2(\R^n)$.

About the Author:

Carlos Cabrelli, University of Buenos Aires. Ursula Molter, University of Buenos Aires.

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