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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 operator is a normal operator (or some of its generalization).
A closely related operator is a spectraloid operator: an operator whose spectral radius coincides with its numerical radius. In fact, an operator ''T'' is convexoid if and only if is spectraloid for every complex number .
== See also ==
*Aluthge transform
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