Polyharmonic approximation on the sphere

Details Polyharmonic approximation on the sphere Polyharmonic approximation on the sphere

2008-11-25

arxiv.org/abs/0811.4175v2

Constr. Approx. Volume 33, Number 1, pp. 77-92 (2011)

Mathematics

Classical Analysis and ODEs

16 pages; revised version; to appear in Constr. Approx

Scientific paper

10.1007/s00365-010-9093-8

The purpose of this article is to provide new error estimates for a popular type of SBF approximation on the sphere: approximating by linear combinations of Green's functions of polyharmonic differential operators. We show that the $L_p$ approximation order for this kind of approximation is $\sigma$ for functions having $L_p$ smoothness $\sigma$ (for $\sigma$ up to the order of the underlying differential operator, just as in univariate spline theory). This is an improvement over previous error estimates, which penalized the approximation order when measuring error in $L_p$, p>2 and held only in a restrictive setting when measuring error in $L_p$, p<2.

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