O'Farrell, A.G. and de Paepe, P.J. (1993) Approximation on a disk II. Mathematische Zeitschrift (212). pp. 153-156. ISSN 1432-1823
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Abstract
This paper is a continuation of [P]. The main result of [P] is that there are
functions G defined in a neighborhood of the origin in the complex plane, which
behave in a sense as z2, such that G together with z
2 separates the points of (small)
disks D around the origin, and such that the function algebra [z2, G; D] on Dis not
the same as the algebra C(D) of all continuous functions on D. In this paper we
show that the other possibility also can occur: for a large class of functions
G defined in a neighborhood of the origin we show [z2
, G; D] = C(D) for sufficiently
small disks D around 0. We will adopt notation from [P]. In the following it
will be convenient to write the function G in the form
G(z) = z2 (1 + g(z))2
We like to mention that Pascal Thomas, independently from us and at the
same time, worked out a special case of our main result, i.e. the case g(z) = z,
[T].
Item Type: | Article |
---|---|
Keywords: | Approximation; Disk; |
Academic Unit: | Faculty of Science and Engineering > Mathematics and Statistics |
Item ID: | 14688 |
Identification Number: | 10.1007/BF02571648 |
Depositing User: | Prof. Anthony O'Farrell |
Date Deposited: | 11 Aug 2021 13:33 |
Journal or Publication Title: | Mathematische Zeitschrift |
Publisher: | Springer Berlin / Heidelberg |
Refereed: | Yes |
Related URLs: | |
URI: | https://mural.maynoothuniversity.ie/id/eprint/14688 |
Use Licence: | This item is available under a Creative Commons Attribution Non Commercial Share Alike Licence (CC BY-NC-SA). Details of this licence are available here |
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