Angles between Haagerup–Schultz projections and spectrality of operators
Angles between Haagerup–Schultz projections and spectrality of operators
复制标题
Haagerup-Schultz 投影与算子谱之间的角度
DOI:
10.1016/j.jfa.2021.109027
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发表时间:
2021
影响因子:
1.7
通讯作者:
Krishnaswamy-Usha, Amudhan
中科院分区:
文献类型:
--
作者:
Dykema, Ken;Krishnaswamy-Usha, Amudhan
We investigate angles between Haagerup–Schultz projections of operators belonging to finite von Neumann algebras, in connection with a property analogous to Dunford's notion of spectrality of operators. In particular, we show that an operator is similar to the sum of a normal and an s.o.t.-quasinilpotent operator that commute if and only if the angles between its Haagerup–Schultz projections are uniformly bounded away from zero (and we call this the uniformly non-zero angles property). Moreover, we show that spectrality is equivalent to this uniformly non-zero angles property plus decomposability. Finally, using this characterization, we construct an easy example of an operator which is decomposable but not spectral, and we show that Voiculescu's circular operator is not spectral (nor is any of the circular free Poisson operators).
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DOI:
10.1007/s10240-009-0018-7
发表时间:
2006
期刊:
Publications mathématiques
影响因子:
--
作者:
U. Haagerup;Hanne Schultz
通讯作者:
Hanne Schultz
DOI:
--
发表时间:
1996
期刊:
影响因子:
--
作者:
A. Nica;R. Speicher
通讯作者:
R. Speicher
影响因子:
0.8
作者:
K. Dykema;J. Noles;D. Zanin
通讯作者:
D. Zanin
DOI:
--
发表时间:
1969
期刊:
影响因子:
--
作者:
J. Stampfli
通讯作者:
J. Stampfli
DOI:
--
发表时间:
2005
期刊:
影响因子:
--
作者:
Hanne Schultz
通讯作者:
Hanne Schultz