Some Results of Zoltán Ésik on Regular Languages
Zoltán Ésik published 2 books as an author, 32 books as editor and over 250 scientific papers in journals, chapters and conferences. It was of course impossible to survey such an impressive list of results and in this lecture, I will only focus on a very small portion of Zoltán’s scientific work. The first topic will be a result from 1998, obtained by Zoltán jointly with Imre Simon, in which he solved a twenty year old conjecture on the shuffle operation. The second topic will be his algebraic study of various fragments of logic on words. Finally I will briefly describe some results on commutative languages obtained by Zoltán, Jorge Almeida and myself.
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