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On Copositive Approximation in Spaces of Continuous Functions I:The Alternation Property of Copositive Approximation 被引量:1
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作者 Aref K.Kamal 《Analysis in Theory and Applications》 CSCD 2015年第4期354-372,共19页
In this paper the author writes a simple characterization for the best copositive approximation to elements of C(Q) by elements of finite dimensional strict Chebyshev subspaces of C(Q) in the case when Q is any compac... In this paper the author writes a simple characterization for the best copositive approximation to elements of C(Q) by elements of finite dimensional strict Chebyshev subspaces of C(Q) in the case when Q is any compact subset of real numbers. At the end of the paper the author applies this result for different classes of Q. 展开更多
关键词 Strict Chebyshev spaces best copositive approximation change of sign
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ON COPOSITIVE APPROXIMATION IN SOME CLASSICAL SPACES OF SEQUENCES 被引量:1
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作者 Aref Kamal 《Analysis in Theory and Applications》 2003年第2期136-144,共9页
In this paper the author writes a simple characterization for the best copositive approximation in c; the space of convergent sequences, by elements of finite dimensional Chebyshev subspaces, and shows that it is u-ni... In this paper the author writes a simple characterization for the best copositive approximation in c; the space of convergent sequences, by elements of finite dimensional Chebyshev subspaces, and shows that it is u-nique. 展开更多
关键词 Chebyshev subspaces best copositive approximation changing of sign
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On Copositive Approximation in Spaces of Continuous Functions Ⅱ:The Uniqueness of Best Copositive Approximation
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作者 Aref K. Kamal 《Analysis in Theory and Applications》 CSCD 2016年第1期20-26,共7页
This paper is part II of "On Copositive Approximation in Spaces of Contin- uous Functions". In this paper, the author shows that if Q is any compact subset of real numbers, and M is any finite dimensional strict Che... This paper is part II of "On Copositive Approximation in Spaces of Contin- uous Functions". In this paper, the author shows that if Q is any compact subset of real numbers, and M is any finite dimensional strict Chebyshev subspace of C (Q), then for any admissible function f ∈ C(Q)/M, the best copositive approximation to f from M is unique. 展开更多
关键词 Strict Chebyshev spaces best copositive approximation change of sign.
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