Isolated maximal d.r.e. degrees |
| |
Authors: | Yong Liu |
| |
Institution: | Department of Mathematics, National University of Singapore, 10 Lower Kent Ridge Road, 119076 Singapore |
| |
Abstract: | There are very few results about maximal d.r.e. degrees as the construction is very hard to work with other requirements. In this paper we show that there exists an isolated maximal d.r.e. degree. In fact, we introduce a closely related notion called -cupping degree and show that there exists an isolated -cupping degree, and there exists a proper -cupping degree. It helps understanding various degree structures in the Ershov Hierarchy. |
| |
Keywords: | 03D25 03D28 Maximal d r e degree Isolation Cupping degree |
本文献已被 ScienceDirect 等数据库收录! |
|