Abstract
We study the solutions of an equation of the form Lu=f, where L is a pseudo-differential operator defined for functions on the unit sphere embedded in a Euclidean space, f is a given function, and u is the desired solution. We give conditions under which the solution exists, and deduce local smoothness properties of u given corresponding local smoothness properties of f, measured by local Besov spaces. We study the global and local approximation properties of the spectral solutions, describe a method to obtain approximate solutions using values of f at points on the sphere and polynomial operators, and describe the global and local rates of approximation provided by our polynomial operators.
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The research of this author was supported, in part, by grant DMS-0204704 from the National Science Foundation and grant W911NF-04-1-0339 from the U.S. Army Research Office
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Le Gia, Q., Mhaskar, H. Polynomial operators and local approximation of solutions of pseudo-differential equations on the sphere. Numer. Math. 103, 299–322 (2006). https://doi.org/10.1007/s00211-006-0676-z
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DOI: https://doi.org/10.1007/s00211-006-0676-z