Homogeneous polynomial approximation on convex and star like domains

Kroó, András (2023) Homogeneous polynomial approximation on convex and star like domains. DOLOMITES RESEARCH NOTES ON APPROXIMATION, 16 (1). pp. 1-9. ISSN 2035-6803

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Abstract

In the present paper we consider the following central problem on the approximation by homogeneous polynomials: For which 0-symmetric star like domains K ⊂ ℝd and which f ∈ C(∂ K) there exist homogeneous polynomials hn, hn+1 of degree n and n + 1, respectively, so that uniformly on ∂ K (formula presented) This question is the analogue of the Weierstrass approximation problem when polynomials of total degree are replaced by the homogeneous polynomials. A survey of various recent results on the above question is given with some relevant open problems being included, as well. © 2023, Padova University Press. All rights reserved.

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