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The Numerical Range of an Unbounded Operator

M. J. Crabb
1976 Proceedings of the American Mathematical Society  

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The numerical range of an unbounded linear operator on a complex Banach space is the whole complex plane.
doi:10.2307/2041849 fatcat:ufryiaxmqngj5e7lgiqjtr5agi
JSTOR Szczepanski
Citation

M. J. Crabb. "The Numerical Range of an Unbounded Operator." Proceedings of the American Mathematical Society (1976) 95