The partial orderings of the computably enumerable ibT-degrees and cl-degrees are not elementarily equivalent
The partial orderings of the computably enumerable ibT-degrees and cl-degrees are not elementarily equivalent
复制标题
可计算可枚举 ibT 度和 cl 度的偏序本质上并不等价
DOI:
10.1016/j.apal.2012.11.002
复制
发表时间:
2013-05
影响因子:
0.8
通讯作者:
Kraeling, Thorsten
中科院分区:
文献类型:
--
作者:
Ambos-Spies, Klaus;Bodewig, Philipp;Fan, Yun;Kraeling, Thorsten
We show that, in the partial ordering (Rcl,⩽) of the computably enumerable (c.e.) computable Lipschitz (cl) degrees, there is a degree a>0 such that the class of the degrees which do not cup to a is not bounded by any degree less than a. Since Ambos-Spies (in press) [1] has shown that, in the partial ordering (RibT,⩽) of the c.e. identity-bounded Turing (ibT) degrees, for any degree a>0 the degrees which do not cup to a are bounded by the 1-shift a+1 of a where a+1<a, it follows that the elementary theories of the partial orderings (Rcl,⩽) and (RibT,⩽) differ.
登录
查看更多内容
DOI:
10.1007/978-0-387-68441-3
发表时间:
2010-01-01
期刊:
ALGORITHMIC RANDOMNESS AND COMPLEXITY
影响因子:
--
作者:
Downey, Rodney G.;Hirschfeldt, Denis R.
通讯作者:
Hirschfeldt, Denis R.
DOI:
10.1016/j.apal.2005.10.001
发表时间:
2006-08
期刊:
Ann. Pure Appl. Log.
影响因子:
--
作者:
通讯作者:
--
影响因子:
0.5
作者:
P. Odifreddi
通讯作者:
P. Odifreddi
DOI:
10.1007/11494645_2
发表时间:
2005-06
期刊:
--
影响因子:
--
作者:
George Barmpalias
通讯作者:
George Barmpalias
影响因子:
0.5
作者:
K. Ambos-Spies;Decheng Ding;Yun Fan;W. Merkle
通讯作者:
K. Ambos-Spies;Decheng Ding;Yun Fan;W. Merkle