The combinatorial equivalence of a computability theoretic question
Abstract
We show that a question of Miller and Solomon -- that whether there exists a coloring that does not admit a -computable variable word infinite solution, is equivalent to a natural, nontrivial combinatorial question. The combinatorial question asked whether there is an infinite sequence of integers such that each of its initial segment satisfies a Ramsian type property. This is the first computability theoretic question known to be equivalent to a natural, nontrivial question that does not concern complexity notions. It turns out that the negation of the combinatorial question is a generalization of Hales-Jewett theorem. We solve some special cases of the combinatorial question and obtain a generalization of Hales-Jewett theorem on some particular parameters.
Cite
@article{arxiv.2012.13588,
title = {The combinatorial equivalence of a computability theoretic question},
author = {Lu Liu},
journal= {arXiv preprint arXiv:2012.13588},
year = {2020}
}
Comments
23pages