Vector measure orthonormal functions and best approximation for the 4-norm

2003 ◽  
Vol 80 (2) ◽  
pp. 177-190 ◽  
Author(s):  
E. A. S�nchez P�rez
Keyword(s):  
Best Approximation ◽  
Vector Measure

Commutative Sequences of Integrable Functions and Best Approximation With Respect to the Weighted Vector Measure Distance

2005 ◽  
Vol 54 (4) ◽  
pp. 495-510 ◽  
Author(s):  
L. M. García. Raffi ◽  
E. A. Sánchez. Pérez ◽  
J. V. Sánchez. Pérez
Keyword(s):  
Best Approximation ◽  
Vector Measure ◽  
Integrable 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.

Degree of best approximation by trigonometric blending functions

1985 ◽  
Vol 189 (1) ◽  
pp. 143-150 ◽  
Author(s):  
Werner Hau�mann ◽  
Kurt Jetter ◽  
Bernd Steinhaus
Keyword(s):  
Best Approximation ◽  
Blending Functions
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