Publikációk/Publications

[1] K. Kátai-Urbán and Cs. Szabó, Free spectrum of the variety generated by the five element combinatorial Brandt semigroup, Semigroup Forum 73 (2006) 253--260.


[2] K. Kátai-Urbán and Cs. Szabó, On the free spectrum of the variety generated by the combinatorial completely 0-simple semigroups, Glasgow Math. J. 49 (2007) 93--98.


[3] K. Kátai-Urbán and Á. Tritz, Semilattice orders on the homomorphic images of the Rédei semigroup, Period. Math. Hungar. 55 (2007), 61--79.


[4] K. Kátai-Urbán and Cs. Szabó, The pn sequence of semigroup varieties generated by combinatorial 0-simple semigroups, Algebra Universalis 59 (2008), 435--446.


[5] G. Horváth, K. Kátai-Urbán, P. P. Pach, G. Pluhár, A. Pongrácz, Cs. Szabó, The number of monounary algebras, Algebra Universalis, 66 (2011), 81--83.


[6] K. Kátai-Urbán, P. P. Pach, G. Pluhár, A. Pongrácz, Cs. Szabó, On the word problem for syntactic monoids of piecewise testable languages, Semigroup Forum, 84 (2012) 323--332.


[7] G. Horváth, K. Kátai-Urbán, P. P. Pach, G. Pluhár, A. Pongrácz, Cs. Szabó, On free algebras in varieties generated by iterated semidirect products of semilattices, Int. J. Algebra Comput., 22 (2012) no. 7, Paper 1250063. 11 pp.