arXiv:2102.04572 Abstract | arXiv Analytics

arXiv:2102.04572 [math.FA]Abstract References Reviews Resources

An octagon containing the numerical range of a bounded linear operator

Published 2021-02-08Version 1

A polygon is derived that contains the numerical range of a bounded linear operator on a complex Hilbert space, using only norms. In its most general form, the polygon is an octagon, symmetric with respect to the origin, and tangent to the closure of the numerical range in at least four points when the spectral norm is used.

Comments: 8 pages, 3 figures

Categories: math.FA, cs.NA, math.NA

Subjects: 47A12, 47L30, 15A60, 65H17

Keywords: bounded linear operator, numerical range, octagon containing, complex hilbert space, spectral norm

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