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Title: Hermite interpolation in loop groups and conjugate quadrature filter approximation
Authors: Lawton, W.M. 
Keywords: Approximation
Brouwer topological degree
Conjugate quadrature filter
Loop groups
Issue Date: Dec-2004
Citation: Lawton, W.M. (2004-12). Hermite interpolation in loop groups and conjugate quadrature filter approximation. Acta Applicandae Mathematicae 84 (3) : 315-349. ScholarBank@NUS Repository.
Abstract: A classical result of Weierstrass ensures that any continuous finite length trajectory in a vector space can be uniformly approximated by one whose coordinates are trigonometric functions. We derive an analogous result for trajectories in spheres and apply it to show that a continuous frequency response of a conjugate quadrature filter can be uniformly approximated by the frequency response of a finitely supported conjugate quadrature filter. We also extend this result so as to preserve specified roots of the frequency response and derive an approximation result for refinable functions whose integer translates are orthonormal. Our methods utilize properties of loop groups jets and the Brouwer topological degree. © Kluwer Academic Publishers 2004.
Source Title: Acta Applicandae Mathematicae
ISSN: 01678019
DOI: 10.1007/s10440-004-5135-1
Appears in Collections:Staff Publications

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