Δ2 0 -copies of linear orderings

被引：18

作者：

Frolov A.N. ^{[1
]}

机构：

[1] Kazan State University, Kazan

来源：

Algebra and Logic | 2006年 / 45卷 / 3期

基金：

俄罗斯基础研究基金会;

关键词：

Δ[!sub]2[!/sub] [!sup]0[!/sup] -degree; Δ[!sub]2[!/sub] [!sup]0[!/sup] -spectrum; Countable linear ordering;

D O I：

10.1007/s10469-006-0017-4

中图分类号：

学科分类号：

摘要：

It is proved that, for any n ω, there exist countable linear orderings Ln whose Δ 2 0 -spectrum consists of exactly all non n-low Δ 2 0 -degrees. Properties of such orderings are examined, for n = 1 and n = 2. © 2006 Springer Science+Business Media, Inc.

引用

页码：201 / 209

页数：8

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