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COMPACT TOEPLITZ OPERATORS WITH CONTINUOUS SYMBOLS

Published online by Cambridge University Press:  01 May 2009

TRIEU LE
TRIEU LE*
Affiliation:
Department of Pure Mathematics, University of Waterloo, 200 University Avenue West, Waterloo, ON, N2L 3G1, Canada e-mail: t29le@math.uwaterloo.ca
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Abstract

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For any rotation-invariant positive regular Borel measure ν on the closed unit ball whose support contains the unit sphere , let L2a be the closure in L2 = L2(, dν) of all analytic polynomials. For a bounded Borel function f on , the Toeplitz operator Tf is defined by Tf(ϕ) = P(fϕ) for ϕ ∈ L2a, where P is the orthogonal projection from L2 onto L2a. We show that if f is continuous on , then Tf is compact if and only if f(z) = 0 for all z on the unit sphere. This is well known when L2a is replaced by the classical Bergman or Hardy space.

Keywords

Primary 47B35

Information

Type
Research Article
Information
Glasgow Mathematical Journal , Volume 51 , Issue 2 , May 2009 , pp. 257 - 261
Copyright
Copyright © Glasgow Mathematical Journal Trust 2008

References

REFERENCES

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