Let T be an operator on a separable Hilbert space H and T = U｜T｜ be the polar decomposition. T is said to be log-ω-hyponormal if log ｜~T｜ ≥ log｜T｜≥ log ｜~T^＊｜. In this paper we prove that the point spectru...Let T be an operator on a separable Hilbert space H and T = U｜T｜ be the polar decomposition. T is said to be log-ω-hyponormal if log ｜~T｜ ≥ log｜T｜≥ log ｜~T^＊｜. In this paper we prove that the point spectrum of T is equal to its joint point spectrum if T is log-ω-hyponormal. We also prove that a log-ω-hyponormal operator is normaloid, i.e., r（T） =｜｜T｜｜. Finally, we obtain Putnam＇s theorem for log-ω-hyponormal operators.展开更多
It is known that the square of a ω-hyponormal operator is also ω-hyponormal. For any 0〈 p 〈 1, there exists a special invertible operator such that all of its integer powers are all p - ω-hyponormal. In this arti...It is known that the square of a ω-hyponormal operator is also ω-hyponormal. For any 0〈 p 〈 1, there exists a special invertible operator such that all of its integer powers are all p - ω-hyponormal. In this article, the author introduces the class of （s, p） -ω-hyponormal operators on the basis of the class of p- ω-hyponormal operators. For s 〉0, 0 〈 p 〈 1, the author gives a characterization of （s,p） -ω-hyponormal operatots; the author shows that all integer powers of special （s, p） -ω-hyponormal operators are （s,p） -ω-hyzponormal.展开更多
The approximate point spectrum properties of p-ω-hyponormal operators are given and proved. In faet, it is a generalization of approximate point speetrum properties of ω- hyponormal operators. The relation of spectr...The approximate point spectrum properties of p-ω-hyponormal operators are given and proved. In faet, it is a generalization of approximate point speetrum properties of ω- hyponormal operators. The relation of spectra and numerical range of p-ω-hyponormal operators is obtained, On the other hand, for p-ω-hyponormal operators T,it is showed that if Y is normal,then T is also normal.展开更多
本文利用优化理论及拟范数的性质研究了与Hayajneh-Kittaneh猜想相关的算子不等式.设E(M)是非交换对称拟Banach空间,x_(i)∈E(M)^((p)+),y_(i)∈E(M)^((q)+)使得x_(i)y_(i)=y_(i)x_(i),i=1,2,…,n,我们证明了||(∑^(k)_(j)=1 x^(1/2)^(i...本文利用优化理论及拟范数的性质研究了与Hayajneh-Kittaneh猜想相关的算子不等式.设E(M)是非交换对称拟Banach空间,x_(i)∈E(M)^((p)+),y_(i)∈E(M)^((q)+)使得x_(i)y_(i)=y_(i)x_(i),i=1,2,…,n,我们证明了||(∑^(k)_(j)=1 x^(1/2)^(i)y^(1/2)_(i))^(2)||E(M)^((r))≤(∑^(k)_(j)=1_(xi))^(1/2)(∑^(k)_(j)=1 y i)(∑^(k)_(j)=1 x i)^(1/2)||E(M)^((r))≤||(∑^(k)_(j)=1 x i)(∑^(k)_(j)=1 y i)||E(M)^((r)).其中1≤p,q,r<∞且1/r=1/p+1/q.同时我们还给出了一些与log-次优化相关的不等式.展开更多
文摘Let T be an operator on a separable Hilbert space H and T = U｜T｜ be the polar decomposition. T is said to be log-ω-hyponormal if log ｜~T｜ ≥ log｜T｜≥ log ｜~T^＊｜. In this paper we prove that the point spectrum of T is equal to its joint point spectrum if T is log-ω-hyponormal. We also prove that a log-ω-hyponormal operator is normaloid, i.e., r（T） =｜｜T｜｜. Finally, we obtain Putnam＇s theorem for log-ω-hyponormal operators.
基金Science Foundation of Ministry of Education of China
文摘It is known that the square of a ω-hyponormal operator is also ω-hyponormal. For any 0〈 p 〈 1, there exists a special invertible operator such that all of its integer powers are all p - ω-hyponormal. In this article, the author introduces the class of （s, p） -ω-hyponormal operators on the basis of the class of p- ω-hyponormal operators. For s 〉0, 0 〈 p 〈 1, the author gives a characterization of （s,p） -ω-hyponormal operatots; the author shows that all integer powers of special （s, p） -ω-hyponormal operators are （s,p） -ω-hyzponormal.
文摘The approximate point spectrum properties of p-ω-hyponormal operators are given and proved. In faet, it is a generalization of approximate point speetrum properties of ω- hyponormal operators. The relation of spectra and numerical range of p-ω-hyponormal operators is obtained, On the other hand, for p-ω-hyponormal operators T,it is showed that if Y is normal,then T is also normal.
文摘本文利用优化理论及拟范数的性质研究了与Hayajneh-Kittaneh猜想相关的算子不等式.设E(M)是非交换对称拟Banach空间,x_(i)∈E(M)^((p)+),y_(i)∈E(M)^((q)+)使得x_(i)y_(i)=y_(i)x_(i),i=1,2,…,n,我们证明了||(∑^(k)_(j)=1 x^(1/2)^(i)y^(1/2)_(i))^(2)||E(M)^((r))≤(∑^(k)_(j)=1_(xi))^(1/2)(∑^(k)_(j)=1 y i)(∑^(k)_(j)=1 x i)^(1/2)||E(M)^((r))≤||(∑^(k)_(j)=1 x i)(∑^(k)_(j)=1 y i)||E(M)^((r)).其中1≤p,q,r<∞且1/r=1/p+1/q.同时我们还给出了一些与log-次优化相关的不等式.
