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首页> 外文期刊>Journal of knot theory and its ramifications >Computable isomorphisms for certain classes of infinite graphs
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Computable isomorphisms for certain classes of infinite graphs

机译:某些类无限图表的可计算同构

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We investigate (2,1):1 structures, which consist of a countable set A together with a function f : A - A such that for every element x in A, f maps either exactly one element or exactly two elements of A to x. These structures extend the notions of injection structures, 2:1 structures, and (2,0):1 structures studied by Cenzer, Harizanov, and Remmel, all of which can be thought of as infinite directed graphs. We look at various computability-theoretic properties of (2,1):1 structures, must notably that of computable categoricity. We say that a structure A is computably categorical if there exists a computable isomorphism between any two computable copies of A. We give a sufficient condition under which a (2,1):1 structure is computably categorical, and present some examples of (2,1):1 structures with different computability-theoretic properties.
机译:我们调查(2,1):1结构,该结构由可数集合与功能F:A - &GT组成; 对于每个元素x,f的恰好地映射到恰好一个元素或恰好两个元素。 这些结构延伸了注射结构的概念,2:1结构,(2,0):由CENZER,HARIZANOV和REMMEL研究的1个结构,所有这些结构都可以被认为是无限的指导图。 我们看出(2,1):1结构的各种可计算性 - 理论性质,必须特别是可计算的分类。 我们说,如果A的任何两个可计算副本之间存在可计算的同构,则可以提供一个结构a。我们给出了足够的条件,其中a(2,1):1结构是可计算地分类的,并且存在于(2 1):1个具有不同可计算性 - 理论性质的结构。

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