Bonsall F.F., Duncan J. Numerical Ranges II

Cambridge: Cambridge University Press, 1973. — 184 p.Numerical Ranges II is a sequel to Numerical Ranges of Operators on Normed Spaces and of Elements of Normed Algebras written by the same authors and published in this series in 1971. The present volume reflects the progress made in the subject, expanding and discussing topics under the general headings of spatial and algebra numerical ranges and further ranges.
without index.Spatial Numerical Ranges
Algebra numerical ranges
Further ranges