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Caston, L., Savova, M., Spitkovsky, I. and Zobin, N. (2001) On Eigenvalues and Boundary Curvature of the Numerical Range. Linear Algebra and Its Applications, 322, 129-140.
http://dx.doi.org/10.1016/S0024-3795(00)00231-7

has been cited by the following article:

• TITLE: On Eigenvalues and Boundary Curvature of the Numerical Rang of Composition Operators on Hardy Space

  AUTHORS: Mohammad Taghi Heydari

  KEYWORDS: Composition Operator, Numerical Range, Eigenvalues, Curvature

  JOURNAL NAME: Advances in Pure Mathematics, Vol.5 No.6, May 6, 2015

  ABSTRACT: For a bounded linear operator A on a Hilbert space H, let M(A) be the smallest possible constant in the inequality . Here, p is a point on the smooth portion of the boundary of the numerical range of A. is the radius of curvature of at this point and is the distance from p to the spectrum of A. In this paper, we compute the M(A) for composition operators on Hardy space H2.