We study Harper operators and the closely related discrete magnetic Laplacians (DML) on a graph with a free action of a discrete group, as defined by Sunada [Sun]. A main result in this paper is that the spectral density function of DMLs associated to rational weight functions on graphs with a free
On Spectral Approximation of Linear Operators
โ Scribed by Rafikul Alam
- Publisher
- Elsevier Science
- Year
- 1998
- Tongue
- English
- Weight
- 201 KB
- Volume
- 226
- Category
- Article
- ISSN
- 0022-247X
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## Abstract A unified class of linear positive operators has been defined. Using these operators some approximation estimates have been obtained for unbounded functions. For particular linear positive operators these results sharpen and improve the earlier estimates due to Fuhua Cheng (J. Approx. T
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