A remark on numerical range of semi-hyponormal operators
A remark on numerical range of semi-hyponormal operators
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DOI:
10.1080/03081080902872215
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发表时间:
2010-09
影响因子:
1.1
通讯作者:
M. Chō;T. Huruya
中科院分区:
文献类型:
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作者:
M. Chō;T. Huruya
Let U be the unilateral shift on ℓ2. For any complex numbers α and β, put T = αU + βU* and S = T 2. Then we show that the operator S is convexoid.