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Density of Recursively Inseparable R. E. Sets and Universal Recrusively Inseparability
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作者 丁德成 《Acta Mathematica Sinica,English Series》 SCIE 1986年第4期337-342,共6页
Problems about density are remarkable in the theory of degrees of unsolvability. Owing to their difficulty few results have been obtained till now. Sacks 1964 showed that the r. e. degrees are dense; Fejer 1980 showed... Problems about density are remarkable in the theory of degrees of unsolvability. Owing to their difficulty few results have been obtained till now. Sacks 1964 showed that the r. e. degrees are dense; Fejer 1980 showed that nonbraching degrees are dense in the r.e. degrees, this is the first nontrivial definable subset of the degrees known to be dense. 展开更多
关键词 SHOW Sets and Universal recrusively Inseparability Density of Recursively Inseparable R
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