Macs'06 6th Joint Conference on Mathematics and Computer Science

Edited by Zoltán Csörnyei Eötvös Loránd University Budapest, Hungary University of Pécs Pécs, Hungary Babeş–Bolyai University Cluj–Napoca Romania 2 6th Joint Conf. on Math. and Comp. Sci., July 12–15, 2006, Pécs, Hungary MaCS’06 6th Joint Conference on Mathematics and Computer Science organized by the Babeş–Bolyai University, Cluj–Napoca, Romania Eötvös Loránd University, Budapest, Hungary University of Pécs, Pécs, Hungary Hungarian Academy of Sciences, Budapest, Hungary Bolyai János Mathematical Society, Budapest, Hungary held in Pécs, Hungary, July 12–15, 2006 The Patron of the MaCS’06 Conference is J. Vörös, Senior Vice Rector, University of Pécs, Pécs, Hungary Co-Chairs P. T. Mocanu (Babeş–Bolyai University, Cluj–Napoca, Romania) Z. Sebestyén (Eötvös Loránd University, Budapest, Hungary) Scientific Board W. W. Breckner (Babeş–Bolyai University, Cluj–Napoca, Romania) G. Coman (Babeş–Bolyai University, Cluj–Napoca, Romania) Z. Daróczy (University of Debrecen, Debrecen, Hungary) J. Janszky (University of Pécs, Pécs, Hungary) Z. Kása (Babeş–Bolyai University, Cluj–Napoca, Romania) J. Kolumbán (Babeş–Bolyai University, Cluj–Napoca, Romania) L. Kozma (Eötvös Loránd University, Budapest, Hungary) Gy. Michaletzky (Eötvös Loránd University, Budapest, Hungary) M. Mureşan (Babeş–Bolyai University, Cluj–Napoca, Romania) Zs. Páles (University of Debrecen, Debrecen, Hungary) I. A. Rus (Babeş–Bolyai University, Cluj–Napoca, Romania) F. Schipp (Eötvös Loránd University, Budapest, Hungary) P. Szilágyi (Sapientia University, Cluj–Napoca, Romania) S. Szabó (University of Pécs, Pécs, Hungary) Organizing Committee P. Ádám (University of Pécs, Pécs, Hungary) Z. Csörnyei (Eötvös Loránd University, Budapest, Hungary) S. Hegyi (University of Pécs, Pécs, Hungary) S. Horváth (Eötvös Loránd University, Budapest, Hungary) S. Jenei (University of Pécs, Pécs, Hungary) S. Komlósi (University of Pécs, Pécs, Hungary) M. Koniorczyk (University of Pécs, Pécs, Hungary) M. Pap (University of Pécs, Pécs, Hungary) A. Petruşel (Babeş–Bolyai University, Cluj–Napoca, Romania) A. Soós (Babeş–Bolyai University, Cluj–Napoca, Romania) L. Tóth (University of Pécs, Pécs, Hungary) B. Vizvári (Eötvös Loránd University, Budapest, Hungary) Typesetting in LTEX by the authors of the abstracts and by the editor Faculty of Informatics, Eötvös Loránd University Pázmány Péter sétány 1/C., Budapest, Hungary, H-1117 6th Joint Conf. on Math. and Comp. Sci., July 12–15, 2006, Pécs, Hungary 3