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Bivariate Lagrange interpolation at the Chebyshev nodes

Author: Lawrence A. Harris
Journal: Proc. Amer. Math. Soc. 138 (2010), 4447-4453
MSC (2010): Primary 65D05, 65D32; Secondary 33C50, 41A05, 42B05
Published electronically: July 15, 2010
MathSciNet review: 2680069
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Abstract: We discuss Lagrange interpolation on two sets of nodes in two dimensions where the coordinates of the nodes are Chebyshev points having either the same or opposite parity. We use a formula of Xu for Lagrange polynomials to obtain a general interpolation theorem for bivariate polynomials at either set of Chebyshev nodes. An extra term must be added to the interpolation formula to handle all polynomials with the same degree as the Lagrange polynomials. We express this term as a specifically determined linear combination of canonical polynomials that vanish on the set of Chebyshev nodes being considered.

As an application we deduce in an elementary way known minimal and near minimal cubature formulas applying to both the even and the odd Chebyshev nodes. Finally, we restrict to triangular subsets of the Chebyshev nodes to show unisolvence and deduce a Lagrange interpolation formula for bivariate symmetric and skew-symmetric polynomials. This result leads to another proof of the interpolation formula.

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Lawrence A. Harris
Affiliation: Department of Mathematics, University of Kentucky, Lexington, Kentucky 40506

Received by editor(s): April 5, 2009
Received by editor(s) in revised form: March 6, 2010
Published electronically: July 15, 2010
Communicated by: Walter Van Assche
Article copyright: © Copyright 2010 American Mathematical Society
The copyright for this article reverts to public domain 28 years after publication.

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