4 papers
On intra-regular and some left regular -semigroups
Niovi Kehayopulu, Michael Tsingelis
We characterize the intra-regular -semigroups and the left regular -semigroups in which for every in terms of filters and we prove, among othe…
On intra-regular and left regular and left duo ordered -semigroups
Niovi Kehayopulu, Michael Tsingelis
For an intra-regular or a left regular and left duo ordered -semigroup , we describe the principal filter of which plays an essential role in the structure of this type o…
Fuzzy semiprime subsets of ordered groupoids (groupoids)
Niovi Kehayopulu, Michael Tsingelis
A fuzzy subset of an ordered semigroup (or semigroup) is called fuzzy semiprime if for every (Definition 1). Following the terminology of semiprim…
Comment on "Generalized ideal elements in --semigroups"
Niovi Kehayopulu, Michael Tsingelis
Concerning the paper in the title by K. Hila and E. Pisha in Commun. Korean Math. Soc. Volume 26, Issue 3 (2011), 373--384, we give our results and make the main corrections.