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Some inequalities for the numerical radius for Hilbert C*C^{*}-modules space operators
Georgian Mathematical Journal ( IF 0.8 ) Pub Date : 2021-04-01 , DOI: 10.1515/gmj-2019-2053
Mohsen Shah Hosseini 1 , Mohsen Erfanian Omidvar 2 , Baharak Moosavi 3 , Hamid Reza Moradi 4
Affiliation  

We extend some numerical radius inequalities for adjointable operators on Hilbert C*{C^{*}}-modules. A new refinement of a numerical radius inequality for some Hilbert space operators is given. More precisely, we prove that if T∈ℬ⁢(ℋ){T\in\mathcal{B}(\mathcal{H})} is an invertible operator, then ∥T∥2≤∥T∥2+1∥T-1∥22≤ω⁢(T).\frac{\|T\|}{2}\leq\frac{\sqrt{\|T\|^{2}+\frac{1}{\|T^{-1}\|^{2}}}}{2}\leq% \omega(T).

中文翻译:

Hilbert C * C ^ {*}-模块空间算子的数值半径的一些不等式

我们扩展了希尔伯特C * {C ^ {*}}-模块上可算符的一些数值半径不等式。给出了一些希尔伯特空间算子的数值半径不等式的新改进。更确切地说,我们证明如果T∈ℬ⁢(ℋ){T \ in \ mathcal {B}(\ mathcal {H})}是可逆算符,则∥T∥2≤∥T∥2+1∥T -1∥22≤ω⁢(T)。\ frac {\ | T \ |} {2} \ leq \ frac {\ sqrt {\ | T \ | ^ {2} + \ frac {1} {\ | T ^ {-1} \ | ^ {2}}}} {2} \ leq%\ omega(T)。
更新日期:2021-03-29
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