The closure of the numerical range contains the spectrum. (English) Zbl 0137.32501

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[1] Marshall Harvey Stone, Linear transformations in Hilbert space, American Mathematical Society Colloquium Publications, vol. 15, American Mathematical Society, Providence, RI, 1990. Reprint of the 1932 original. · Zbl 0005.40003
[2] P. A. Alexandroff, Combinatorial topology, Graylock, Rochester, N. Y., 1956. · Zbl 0070.17902
[3] Felix E. Browder, Remarks on nonlinear functional equations, Proc. Nat. Acad. Sci. U.S.A. 51 (1964), 985 – 989. · Zbl 0126.12301
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