0411178 20240103182307.420060210235959.9 Linz JKU Linz 2003 4 s. 135-138KlementE. P.MesiarR. triangular norm Archimedean t-norm aggregation operator cav_un_auth*0208902 Klement E.P. AT cav_un_auth*0101163 Mesiar Radko UTIA-B Department of Econometrics Ústav teorie informace a automatizace AV ČR, v. v. i. cav_un_auth*0021106 Pap E. CS 12A CEZ:AV0Z1075907 Triangular norms are, on the one hand, special semigroups and, on the other hand, solutions of some functional equations. This mixture quite often requires new approaches to answer questions about the nature of triangular norms. There are some problems which were stated some time ago and remained unsolved for years. The aim of this paper is to recall some well-known problems of the past and to state several problems which are open and have not been posed so far for a wider audience. cav_un_auth*0213100 Linz Seminar on Fuzzy Set Theory /24./ Linz AT 04.02.2003-08.02.2003 BI E http://hdl.handle.net/11104/0131264 UTIA-B 20030165 2003 2003 Linz JKU Linz Triangular Norms and Related Operators in Many-Valued Logics 135 138 Klement E. P. 340 Mesiar R. 340