scholarly journals Enclosure of the Numerical Range of a Class of Non-selfadjoint Rational Operator Functions

2017 ◽  
Vol 88 (2) ◽  
pp. 151-184 ◽  
Author(s):  
Christian Engström ◽  
Axel Torshage
Keyword(s):  
Numerical Range ◽  
Operator Functions

scholarly journals The block numerical range of analytic operator functions

2014 ◽  
pp. 901-934
Author(s):  
Agnes Radl ◽  
Christiane Tretter ◽  
Markus Wagenhofer
Keyword(s):  
Numerical Range ◽  
Analytic Operator ◽  
Operator Functions

A new method for approximation of closed convex subsets of B(H)

Filomat ◽  
2017 ◽  
Vol 31 (19) ◽  
pp. 6005-6013
Author(s):  
Mahdi Iranmanesh ◽  
Fatemeh Soleimany
Keyword(s):  
Best Approximation ◽  
Numerical Range ◽  
New Method ◽  
C Algebra ◽  
Convex Subsets

In this paper we use the concept of numerical range to characterize best approximation points in closed convex subsets of B(H): Finally by using this method we give also a useful characterization of best approximation in closed convex subsets of a C*-algebra A.

Continuity of submatrices and Ritz sets associated to a point in the numerical range

2021 ◽  
Vol 624 ◽  
pp. 1-13
Author(s):  
Kennett L. Dela Rosa ◽  
Hugo J. Woerdeman
Keyword(s):  
Numerical Range

a-Numerical range on $$C^*$$-algebras

Positivity ◽  
2021 ◽  
Author(s):  
Abdellatif Bourhim ◽  
Mohamed Mabrouk
Keyword(s):  
Numerical Range ◽  
C Algebras

On the maximal numerical range of the bimultiplication M2,A,B

2021 ◽  
pp. 1-8
Author(s):  
Abderrahim Baghdad ◽  
Chraibi Kaadoud Mohamed
Keyword(s):  
Numerical Range

scholarly journals $L$-ideals and numerical range preservation

1977 ◽  
Vol 21 (2) ◽  
pp. 365-373 ◽  
Author(s):  
C. K. Chui ◽  
P. W. Smith ◽  
R. R. Smith ◽  
J. D. Ward
Keyword(s):  
Numerical Range
Sign in / Sign up

Export Citation Format

Share Document