If f # L 1 (d+) is harmonic in the space GÂK, where + is a radial measure with +(GÂK)=1, we have, by the mean value property f = f V +. Conversely, does this mean value property imply that f is harmonic ? In this paper we give a new and natural proof of a result obtained by P. Ahern, A. Flores, W. R
Type-2 computability on spaces of integrable functions
✍ Scribed by Daren Kunkle
- Publisher
- John Wiley and Sons
- Year
- 2004
- Tongue
- English
- Weight
- 238 KB
- Volume
- 50
- Category
- Article
- ISSN
- 0044-3050
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✦ Synopsis
Abstract
Using Type‐2 theory of effectivity, we define computability notions on the spaces of Lebesgue‐integrable functions on the real line that are based on two natural approaches to integrability from measure theory. We show that Fourier transform and convolution on these spaces are computable operators with respect to these representations. By means of the orthonormal basis of Hermite functions in L~2~, we show the existence of a linear complexity bound for the Fourier transform. (© 2004 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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