The omega-inequality problem for concatenation hierarchies of star-free languages
arXiv:1601.08237 · doi:10.1515/forum-2016-0028
Abstract
The problem considered in this paper is whether an inequality of omega-terms is valid in a given level of a concatenation hierarchy of star-free languages. The main result shows that this problem is decidable for all (integer and half) levels of the Straubing-Thérien hierarchy.