Research interests. Algebraic theory of automata and languages. In particular, connections with semigroup theory, combinatorics, logic and topology.
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- 45 Why is Lebesgue so often spelled "Lebesque"?
- 40 I get a wrong determinant - why?
- 30 Why does intersection always preserve "closed" structures?
- 25 Complexity zoo for unary languages
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- 19 How to create DFA from regular expression without using NFA?
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