Title of article
Betterment for estimates of the numerical radii of Hilbert space operators
Author/Authors
Davarpanah ، Mohammad Department of Mathematics - Islamic Azad University, Ferdows Branch , Moradi ، Hamid Reza Department of Mathematics - Payame Noor University (PNU)
From page
161
To page
167
Abstract
We give several inequalities involving numerical radii ω (·) and the usual operator norm k·k of Hilbert space operators. These inequalities lead to a considerable improvement in the well-known inequalities 1/2 ||T|| ≤ ω (T) ≤ ||T|| .
Keywords
Numerical radius , Usual operator norm , Inequality , Contraction operator
Journal title
AUT Journal of Mathematics and Computing
Journal title
AUT Journal of Mathematics and Computing
Record number
2757819
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