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Randomness and universal machines

机译:随机和通用机器

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The present work investigates several questions from a recent survey of Miller and Nies related to Chaitin's Ω numbers and their dependence on the underlying universal machine. Furthermore, the notion Ω_U [X] = Σ_(p:U(p)↓∈X)2~(-|p|) is studied for various sets X and universal machines U. A universal machine U is constructed such that for all x,Ω_U [{x}] = 2~(1-H(x)). For such a universal machine there exists a co-r.e. set X such that Ω_U [X] is neither left-r.e. nor Martin-Loef random. Furthermore, one of the open problems of Miller and Nies is answered completely by showing that there is a sequence U_n of universal machines such that the truth-table degrees of the Ω_(U_n) form an antichain. Finally, it is shown that the members of hyperimmune-free Turing degree of a given Π_1~0-class are not low for Ω unless this class contains a recursive set.
机译:本研究调查了最近对Miller和Nies进行的调查中与查伊廷Ω数及其对基础通用机器的依赖性有关的几个问题。此外,概念Ω_U[X] =Σ_(p:U(p)↓∈X)2〜(-| p |)研究各种集合X和通用机器U。 x,Ω_U[{x}] = 2〜(1-H(x))。对于这样的通用机器,存在协同作用。设置X,使得Ω_U[X]都不为左。也不是Martin-Loef随机的。此外,通过显示存在通用机器序列U_n使得Ω_(U_n)的真值表度形成反链,可以完全解决Miller和Nies的一个开放问题。最后,表明给定的Π_1〜0类的无超免疫图灵度的成员对于Ω不低,除非该类包含递归集。

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