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

• 作 者: Mohammad Taghi Heydari
• 机 构: DepartmentofMathematics
• 出 处: 理论数学进展(英文)
• 发表日期: 2015年6期
• 关键词: Composition OPERATOR NUMERICAL RANGE EIGENVALUES CURVATURE Composition Operator

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