English

The combinatorial equivalence of a computability theoretic question

Logic 2020-12-29 v1 Combinatorics

Abstract

We show that a question of Miller and Solomon -- that whether there exists a coloring c:d<ωkc:d^{<\omega}\rightarrow k that does not admit a cc-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.

Keywords

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

R2 v1 2026-06-23T21:25:05.478Z