convexoid operator

convexoid operator: мат.

выпуклоидный оператор (оператор, для которого замыкание его числового образа совпадает с выпуклой оболочкой его спектра)

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Convexoid operator — In mathematics, especially operator theory, a convexoid operator is a bounded linear operator T on a complex Hilbert space H such that the closure of the numerical range coincides with the convex hull of its spectrum. An example of such an… … Wikipedia
Numerical range — In the mathematical field of linear algebra and convex analysis, the numerical range of a square matrix with complex entries is a subset of the complex plane associated to the matrix. If A is an n × n matrix with complex entries, then… … Wikipedia

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