MMN-1972

# Sharp partial closure operator

*Branimir Seselja*;

*Anna Slivkova*;

*Andreja Tepavcevic*;

## Abstract

As an improvement of existing relationships among collections of sets, closure operators and posets, a particular, so called sharp partial closure operator (SPCO) is introduced. It is proved that there is always a unique SPCO corresponding to a given partial closure system. Moreover, an SPCO has the greatest domain among all partial operators corresponding to a given system. If it is a function, an SCPO is a classical closure operator. Dealing with partial closure systems, we introduce principal ones, corresponding to principal ideals of a poset and accordingly, we define principal SPCO's. Finally, we prove a representation theorem for posets in terms of principal SPCO's and principal partial closure systems.

Vol. 19 (2018), No. 1, pp. 569-579

DOI: 10.18514/MMN.2018.1972