scholarly journals Best approximation of the identity mapping: The case of variable finite memory

2006 ◽  
Vol 143 (1) ◽  
pp. 111-123 ◽  
Author(s):  
Anatoli Torokhti ◽  
Phil Howlett
Filomat ◽  
2017 ◽  
Vol 31 (19) ◽  
pp. 6005-6013
Author(s):  
Mahdi Iranmanesh ◽  
Fatemeh Soleimany

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.


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