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wtt-度的 Nonbounding 定理
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作者 丁德成 《数学学报(中文版)》 SCIE CSCD 北大核心 1989年第6期736-748,共13页
本文用“魔怪方法”证明了对任何一个低的 r.e.集 D,存在一个 r.e.集C,使得 D<_(wtt)C,且对任何 r.e.集 A,B,如果 A≤_(wtt)C,B≤_(wtt)C,A(?)_(wtt)D,B(?)_(wtt)D,则 deg(A)∩deg(B)≠(?).此处 deg(A),deg(B)分别表示 A,B 的 wtt-度.
关键词 nonbounding 定理 部分递归函数
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On Approximation of Nonbounded Continuous Functions
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作者 ZHENGCheng-de WANGRen-hong 《Chinese Quarterly Journal of Mathematics》 CSCD 2003年第1期44-48,共5页
This paper generalizes the basic principle of multiplier-enlargement approach to approximating any nonbounded continuous functions with positive linear operators, and as an example, Bernstein polynomial operators are ... This paper generalizes the basic principle of multiplier-enlargement approach to approximating any nonbounded continuous functions with positive linear operators, and as an example, Bernstein polynomial operators are analysed and studied. This paper gives a certain theorem as a general rule to approximate any nonbounded continuous functions. 展开更多
关键词 positive linear operator approximation of nonbounded continuous function method of multiplier-enlargement Bernstein polynomial operator
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