There are five precomplete classes of De Morgan functions, four of them are defined as sets of functions preserving some finitary relations. However, the fifth class – the class of zigzag De Morgan functions, is not defined by relations. In this paper we announce the following result: zigzag De Morgan functions can be defined as functions preserving some finitary relation.
DOI: 10.46991/PYSUA.2014.48.1.003 Physical and Mathematical Sciences, 48(1 (233) 3-6
