Project information
Algebraic Methods in Automata and Formal Language Theory II
- Project Identification
- GA201/09/1313
- Project Period
- 1/2009 - 12/2011
- Investor / Pogramme / Project type
-
Czech Science Foundation
- Standard Projects
- MU Faculty or unit
-
Faculty of Science
- doc. RNDr. Libor Polák, CSc.
- doc. Mgr. Ondřej Klíma, Ph.D.
- doc. Mgr. Michal Kunc, Ph.D.
- Keywords
- automata, regular languages, varieties, semirings, language equations
The project develops the algebraic methods in formal language theory. We
will further investigate the classes of syntactic structures of regular
languages like (ordered) syntactic monoids and semirings, and syntactic
homomorphisms with the goal of effective characterizations of membership to
important classes of languages. We will treat also classes of meet automata.
We plan to continue our research on implicit language equations, with an
emphasis on properties of their maximal solutions, aiming to identify which
types of systems of language equations have all maximal solutions always
regular. We will also concentrate on algebraic approach to the problem of
state complexity of operations on regular languages represented by two-way
automata.
We will enrich the q-theory and consider various logics for
characterizations of significant classes of languages.
Within the project we are going to continue our broad international
cooperation. The results will be presented at prestigious conferences and in
acknowledged journals.
Results
see http://www.math.muni.cz/~polak/Grant.html
Publications
Total number of publications: 20
2011
-
Subhierarchies of the Second Level in the Straubing-Thrien Hierarchy
International Journal of Algebra and Computation, year: 2011, volume: 21, edition: 7, DOI
2010
-
Computational power of two stacks with restricted communication
Information and Computation, year: 2010, volume: 208, edition: 9
-
Descriptional Complexity of the Languages KaL: Automata, Monoids and Varieties
Descriptional Complexity of Formal Systems, year: 2010
-
Hierarchies of piecewise testable languages
International Journal of Foundations of Computer Science, year: 2010, volume: 21, edition: 4
-
Literally idempotent languages and their varieties - two letter case
International Journal of Foundations of Computer Science, year: 2010, volume: 21, edition: 5
-
New decidable upper bound of the second level in the Straubing-Thérien concatenation hierarchy of star-free languages
Discrete Mathematics & Theoretical Computer Science, year: 2010, volume: 12, edition: 4
-
On Schützenberger products of semirings
Developments in Language Theory, year: 2010
2009
-
A counterexample to a conjecture concerning concatenation hierarchies
Information Processing Letters, year: 2009, volume: 110, edition: 1
-
Piecewise Testable Languages via Combinatorics on Words
Proceedings WORDS 2009, year: 2009
-
Polynomial Operators on Classes of Regular Languages
Algebraic Informatics, year: 2009