Publication details

The omega-inequality problem for concatenation hierarchies of star-free languages

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ALMEIDA Jorge KLÍMA Ondřej KUNC Michal

Year of publication 2018
Type Article in Periodical
Magazine / Source Forum Mathematicum
MU Faculty or unit

Faculty of Science

Keywords Pseudovariety; relatively free profinite semigroup; ordered monoid; concatenation hierarchy; Straubing–Thérien hierarchy
Description 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-Therien hierarchy.
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