Abstract
It has been known that the difference of two composition operators induced by linear fractional self-maps of a ball cannot be nontrivially compact on either the Hardy space or any standard weighted Bergman space. In this paper we extend this result in two significant directions: the difference is extended to general linear combinations and inducing maps are extended to linear fractional maps taking a ball into another possibly of different dimension.
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Acknowledgments
Part of this research was performed during the third author’s visit to Korea University in January 2014. He thanks the mathematics department of Korea University for their hospitality and support.
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B. R. Choe was supported by NRF (2013R1A1A2004736) of Korea, H. Koo was supported by NRF (2012R1A1A2000705) of Korea and NSFC (11271293), and M. Wang was supported by NSFC (11271293).
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Choe, B.R., Koo, H., Wang, M. et al. Compact linear combinations of composition operators induced by linear fractional maps. Math. Z. 280, 807–824 (2015). https://doi.org/10.1007/s00209-015-1449-0
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DOI: https://doi.org/10.1007/s00209-015-1449-0
Keywords
- Linear combination of composition operators
- Linear fractional map
- Compact operator
- Hardy space
- Weighted Bergman space