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Symmetry of the spatial numerical ranges of algebra polynomials and of matrix polynomials

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References

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Translated from Itogi Nauki i Tekhniki, Seriya Sovremennaya Matematika i Ee Prilozheniya. Tematicheskie Obzory. Vol. 49, Functional Analysis-4, 1997.

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Chryssakis, T. Symmetry of the spatial numerical ranges of algebra polynomials and of matrix polynomials. J Math Sci 96, 3716–3721 (1999). https://doi.org/10.1007/BF02172665

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