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
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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
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发表时间:
2013-05
影响因子:
0.8
通讯作者:
Kraeling, Thorsten
Kraeling, Thorsten
中科院分区:
数学2区
文献类型:
--
作者:
Ambos-Spies, Klaus;Bodewig, Philipp;Fan, Yun;Kraeling, Thorsten

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我们证明了,在可计算可列(c.e.)可计算Lipschitz(cl)度,有一个度a>0,使得不属于a的度类不受任何小于a的度的限制。由于Ambos-Spies(出版中)[1]已经证明,在c. e.单位元有界的图灵(IbT)度,对于任意度a>0,不属于a的度由a的1-移位a+1界定,其中a+1<a,由此得出偏序(Rcl,Rcl)和(RibT,Rcl)的基本理论不同。
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.
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: --
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