Title of article :
Best approximation by closed unit balls
Author/Authors :
Kamali, H. R. Department of Mathematics - Ardakan Branch, Islamic Azad university , Mazaheri, H. Faculty of Mathematics - Yazd University , Khadezadeh, H. R. Faculty of Mathematics - Yazd University , Ardakani, H. Faculty of Mathematics - Yazd University
Abstract :
We obtain a sufficint and nesessery theoreoms simple for compactness and weakly compactness of the best approximate sets by closed unit balls. Also we consider relations Kadec-Klee property and shur property with this objects. These theorems are extend of papers mohebi and Narayana.
Keywords :
Best approximation , Orthogonality , Closed unit balls , Kadec-Klee property , Shur property
Journal title :
نظريه تقريب و كاربردهاي آن
