Forbidden substrings, Kolmogorov complexity and almost periodic sequences
Combinatorics
2010-09-28 v1 Discrete Mathematics
Abstract
Assume that for some and for all nutural a set of at most "forbidden" binary strings of length is fixed. Then there exists an infinite binary sequence that does not have (long) forbidden substrings. We prove this combinatorial statement by translating it into a statement about Kolmogorov complexity and compare this proof with a combinatorial one based on Laslo Lovasz local lemma. Then we construct an almost periodic sequence with the same property (thus combines the results of Levin and Muchnik-Semenov-Ushakov). Both the combinatorial proof and Kolmogorov complexity argument can be generalized to the multidimensional case.
Cite
@article{arxiv.1009.4455,
title = {Forbidden substrings, Kolmogorov complexity and almost periodic sequences},
author = {Andrey Rumyantsev and Maxim Ushakov},
journal= {arXiv preprint arXiv:1009.4455},
year = {2010}
}