Numerical ranges of an operator on an indefinite inner product space

DOI10.13001/1081-3810.1000zbMath0851.15018OpenAlexW1510887979MaRDI QIDQ4886697

Chi-Kwong Li, Frank Uhlig, Nam-Kiu Tsing

Publication date: 19 July 1996

Published in: The Electronic Journal of Linear Algebra (Search for Journal in Brave)

Full work available at URL: https://eudml.org/doc/118915

zbMATH Keywords

convexityKrein spaceHermitian formsfield of valueslinear preservergeneralized numerical rangeindefinite inner product space

Mathematics Subject Classification ID

Norms of matrices, numerical range, applications of functional analysis to matrix theory (15A60) Numerical range, numerical radius (47A12) Miscellaneous inequalities involving matrices (15A45) Spaces with indefinite inner product (Kre?n spaces, Pontryagin spaces, etc.) (46C20) Quadratic and bilinear forms, inner products (15A63) Variants of convex sets (star-shaped, ((m, n))-convex, etc.) (52A30)

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