QUASIORDER LATTICES ARE FIVE-GENERATED
Journal Title: Discussiones Mathematicae - General Algebra and Applications - Year 2016, Vol 36, Issue 1
Abstract
transitive relation. The quasiorders on a set A form a complete lattice with respect to set inclusion. Assume that A is a set such that there is no inaccessible cardinal less than or equal to |A|; note that in Kuratowski’s model of ZFC, all sets A satisfy this assumption. Generalizing the 1996 result of Ivan Chajda and G´abor Cz´edli, also Tam´as Dolgos’ recent achievement, we prove that in this case the lattice of quasiorders on A is five-generated, as a complete lattice.
Authors and Affiliations
Julia Kulin
Note on Ideal Based Zero-Divisor Graph of a Commutative Ring
In this paper, we consider the ideal based zero divisor graph I (R) of a commutative ring R. We discuss some graph theoretical properties of I (R) in relation with zero divisor graph. We also relate certain parameters...
Completely Archimedean Semirings
In this paper we give a structural description of completely Archimedean semirings which is an extension of the structure theorem of completely Archimedean semigroups.
ON A PERIOD OF ELEMENTS OF PSEUDO-BCI-ALGEBRAS
The notions of a period of an element of a pseudo-BCI-algebra and a periodic pseudo-BCI-algebra are defined. Some of their properties and characterizations are given.
SUPERIOR SUBALGEBRAS AND IDEALS OF BCK/BCI-ALGEBRAS
The notions of superior subalgebras and (commutative) superior ideals are introduced, and their relations and related properties are investigated. Conditions for a superior ideal to be commutative are provided.
ALL REGULAR-SOLID VARIETIES OF IDEMPOTENT SEMIRINGS
The lattice of all regular-solid varieties of semirings splits in two complete sublattices: the sublattice of all idempotent regular-solid varieties of semirings and the sublattice of all normal regular-solid varieties o...