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Some inequalities for the norm and the numerical radius of linear operators in Hilbert spaces

S. S. Dragomir
2008 Tamkang Journal of Mathematics  
In this paper various inequalities between the operator norm and its numerical radius are provided. For this purpose, we employ some classical inequalities for vectors in inner product spaces due to Buzano, Goldstein-Ryff-Clarke, Dragomir-S ´andor and the author.
doi:10.5556/j.tkjm.39.2008.40 fatcat:dsevubxo45co3ghmrgobfeyyoi