The weak density of properly d-r. e. branching degree in the d-r.e. degrees  

作　　者：陆宏 丁德成 

出　　处：《Science China Mathematics》1999年第7期691-698,共8页中国科学：数学（英文版）

基　　金：Project supported by the National Natural Science Foundation of China (Grant No. 19771045); National 863 Hi-Tech R&D Programme.

摘　　要：It is proved that for any r.e. degreesv <u, there exists a properly d-r.e. degreec such thatc is a branching degree andv <c <u.It is proved that for any r.e. degrees v&lt;u, there exists a properly d-r. e. degree c such that c is a branching degree and v&lt;c&lt;u.

关 键 词：RECURSION THEORY d.r.e. DEGREES branch. 

分 类 号：O142[理学—数学]