Numerical Ranges of Operators on Normed Spaces and of Elements of Normed Algebras

@inproceedings{Bonsall1971NumericalRO,
  title={Numerical Ranges of Operators on Normed Spaces and of Elements of Normed Algebras},
  author={F. F. Bonsall and John Duncan},
  year={1971}
}
1. Numerical range in unital normed algebras 2. Hermitian elements of a complex unital Banach algebra 3. Operators 4. Some recent developments. 

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