Cupping and jump classes in the computably enumerable degrees

Cupping and jump classes in the computably enumerable degrees

We show that there is a cuppable c.e. degree, all of whose cupping partners are high. In particular, not all cuppable degrees are -cuppable, or indeed cuppable for any n, refuting a conjecture by Li. On the other hand, we show that one cannot improve highness to superhighness. We also show that the...

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書目詳細資料
Main Authors:	Greenberg, Noam, Ng, Keng Meng, Wu, Guohua
其他作者:	School of Physical and Mathematical Sciences
格式:	Article
語言:	English
出版:	2022
主題:	Science::Mathematics Array Computable Computably Enumerable Degrees
在線閱讀:	https://hdl.handle.net/10356/154823
標簽:	添加標簽沒有標簽, 成為第一個標記此記錄!
機構:	Nanyang Technological University
語言:	English

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