An Operator Inequality Which Implies Paranormality
An Operator Inequality Which Implies Paranormality
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暗示超自然现象的算子不等式
DOI:
10.7153/mia-02-09
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发表时间:
1999
影响因子:
1
通讯作者:
Derming Wang
中科院分区:
文献类型:
--
作者:
Ariyadasa Aluthge;Derming Wang
Let T be a bounded linear operator on a Hilbert space. Among other things, it is shown that (1) if |T2| |T|2 , then T is paranormal, (2) if T is w -hyponormal, then |T2| |T|2 and |T∗ | |T∗|2 , and (3) if T and T∗ are w -hyponormal, and either ker T ⊆ ker T∗ or ker T∗ ⊆ ker T , then T is normal. Mathematics subject classification (1991): 47B20, 47A63.