Randomness and Recursive Enumerability

Randomness and Recursive Enumerability
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随机性和递归可枚举性

DOI:
10.1137/s0097539799357441
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发表时间:
2001
期刊:
SIAM J. Comput.
影响因子:
--
通讯作者:
T. Slaman
T. Slaman
中科院分区:
--
文献类型:
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作者:
A. Kucera;T. Slaman

文献摘要

被引文献

相似文献

如果存在逼近 $\alpha$ 的有理数 $(a[n]:n\in\omega)$ 逼近 $\alpha$ 和逼近 $\beta$ 的 $(b[n]:n\in\omega)$ 的非递减递归序列以及一个正常数 C,使得对于所有 n,$C(\alpha-a[n])\geq(\beta-b[n])$,一个递归可枚举实数 $\alpha$ 支配另一个 $\beta$。参见[R. M. Solovay,关于 Chaitin 工作的论文(或系列论文)草稿,手稿,IBM Thomas J. Watson 研究中心,纽约州约克敦高地,1974 年,第 11 页。 215]和[G. J. Chaitin,IBM J. Res。发展,21(1977),第350--359页]。我们证明每个递归可枚举随机实数支配所有其他递归可枚举实数。我们得出结论,递归可枚举的随机实数正是$\Omega$-数[G. J. Chaitin,IBM J. Res。发展,21(1977),第350--359页]。其次,我们证明了通用 Martin-Lof 随机性检验中的集合具有随机度量,并且每个递归可枚举随机数都是通用 Martin-Lof 检验中表示的度量之和。
One recursively enumerable real $\alpha$ dominates another one $\beta$ if there are nondecreasing recursive sequences of rational numbers $(a[n]:n\in\omega)$ approximating $\alpha$ and $(b[n]:n\in\omega)$ approximating $\beta$ and a positive constant C such that for all n, $C(\alpha-a[n])\geq(\beta-b[n])$. See [R. M. Solovay, Draft of a Paper (or Series of Papers) on Chaitin's Work, manuscript, IBM Thomas J. Watson Research Center, Yorktown Heights, NY, 1974, p. 215] and [G. J. Chaitin, IBM J. Res. Develop., 21 (1977), pp. 350--359]. We show that every recursively enumerable random real dominates all other recursively enumerable reals. We conclude that the recursively enumerable random reals are exactly the $\Omega$-numbers [G. J. Chaitin, IBM J. Res. Develop., 21 (1977), pp. 350--359]. Second, we show that the sets in a universal Martin-Lof test for randomness have random measure, and every recursively enumerable random number is the sum of the measures represented in a universal Martin-Lof test.