Relation ofin R/M and ≤_T in R
Sui Yue · 2000
It is proved that there are r.e. degrees a and c such that [c][a] and [b]≠[c] for any r.e. degree b≤ T a, where [a] is an element of R/M, the quotient of the recursively enumerable degrees R modulo the cappable degrees M.