On the essential commutant of ()
On the essential commutant of ()
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关于 () 的基本交换律
DOI:
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发表时间:
2008
期刊:
影响因子:
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通讯作者:
Jingbo Xia
中科院分区:
文献类型:
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作者:
Jingbo Xia
Let T(QC) (resp. T) be the C * -algebra generated by the Toeplitz operators {T φ : φ ∈ QC} (resp. {T φ : φ ∈ L∞}) on the Hardy space H 2 of the unit circle. A well-known theorem of Davidson asserts that T(QC) is the essential commutant of T. We show that the essential commutant of T(QC) is strictly larger than T. Thus the image of T in the Calkin algebra does not satisfy the double commutant relation. We also give a criterion for membership in the essential commutant of T(QC).