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The course introduces to combinatorial properties of free monoids
(semigroups resp.). It deals mainly with the structure of submonoids,
with morphisms, and with solutions of equations. Some questions
concerning equality sets represent a more advanced part of the lecture.
The course is complemented by formalization in the proof assistant Isabelle/HOL.
Last update: Holub Štěpán, doc. Mgr., Ph.D. (24.08.2023)
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Předmět je zakončen ústní zkouškou. Last update: Žemlička Jan, doc. Mgr. et Mgr., Ph.D. (10.06.2019)
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C. Choffrut and J. Karhumäki, Combinatorics on words, in: Handbook of Formal Languages (G. Rozenberg and A. Salomaa, eds.), vol. I, Springer-Verlag, Berlin Heidelberg 1997, pp. 329-438.
T. Harju and J. Karhumäki, Morphisms, in: Handbook of Formal Languages (G. Rozenberg and A. Salomaa, eds.), vol. I, Springer-Verlag, Berlin Heidelberg 1997, pp. 439-510.
M. Lothaire, Combinatorics on words, Addison-Wesley, Reading Masachusetts, 1983.
M. Lothaire, Algebraic Combinatorics on words, Cambridge University Press, 2002.
J. Berstel and D. Perrin, Theory of Codes, Academic Press, London 1985. Last update: Žemlička Jan, doc. Mgr. et Mgr., Ph.D. (22.09.2021)
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The student will draw the exam question from a list of covered topics. The content of the question can be further specified if needed. The answer is oral after a written preparation. Last update: Holub Štěpán, doc. Mgr., Ph.D. (14.02.2018)
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1. Properties of submonoids of free monoids. Code. Rank of subsemigroup. F-semigroups. 2. Morphisms. Equation and its solution. Systems of equations and equivalent subsystems. Compactness Theorem. ( "Ehrenfeucht's conjecture"). 3. Test sets. Existence of a finite test set. Equivalence with the Compactness Theorem. 4. Post Correspondence Problem (PCP) and its modofications. Binary equality sets and their structure. Regular equality sets. Last update: Žemlička Jan, doc. Mgr. et Mgr., Ph.D. (22.09.2021)
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Basics of general algebra. Last update: Žemlička Jan, doc. Mgr. et Mgr., Ph.D. (17.05.2019)
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