ACTA MATHEMATICA HUNGARICA, vol.134, no.4, pp.565-570, 2012 (Peer-Reviewed Journal)
Article / Article
ACTA MATHEMATICA HUNGARICA
Science Citation Index Expanded, Scopus
In , Csaszar has introduced the notions of weak structures and the structures alpha(w), pi(w), sigma(w), beta(w). The main aim of this paper is to introduce and study properties of the structures r(w), alpha(w), pi(w), sigma(w) and beta(w).