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1. CMB 2008 (vol 51 pp. 86)

Nakazato, Hiroshi; Bebiano, Natália; Providência, Jo\ ao da
 The Numerical Range of 2-Dimensional Krein Space Operators The tracial numerical range of operators on a $2$-dimensional Krein space is investigated. Results in the vein of those obtained in the context of Hilbert spaces are obtained. Keywords:numerical range, generalized numerical range, indefinite inner product spaceCategories:15A60, 15A63, 15A45
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