Subject
Applied Mathematics,Analysis
Reference18 articles.
1. The numerical range of a normal operator;Berberian;Duke Math. J.,1964
2. On the numerical range of a bounded operator;Donoghue;Michigan Math. J.,1957
3. Introduction to Hilbert Space;Halmos,1957
4. The closure of the numerical range of an operator as spectral set;Hildebrandt;Comm. Pure Appl. Math.,1964
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