Crouzeix's Conjecture Holds for Tridiagonal 3 x 3 Matrices with Elliptic Numerical Range Centered at an Eigenvalue

2018 ◽  
Vol 39 (1) ◽  
pp. 346-364 ◽  
Author(s):  
Christer Glader ◽  
Mikael Kurula ◽  
Mikael Lindström
Keyword(s):  
Numerical Range

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.

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
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