-posets
Decompositions of directed sets with zero
Dénombrement des quasi-ordres sur un ensemble fini
Dense extensions of a partially ordered set.
Dense subsets of ordered sets
Some modifications of the definition of density of subsets in ordered (= partially ordered) sets are given and the corresponding concepts are compared.
Destroying precaliber : an application of a Δ-systems lemma for closed sets
Die Abgeschlossenheit der lexikographischen Summe in der Klasse distributiver Verbände
Die Abgeschlossenheit der lexikographischen Summe in der Klasse modularer Verbände
Die arithmetische Operation der Summe
Die arithmetischen Operationen für geordnete Mengen
Die Dimensionsformel in Halbordnungen.
Die Minimalbasis der Menge aller nicht in die projektive Ebene einbettbaren Graphen.
Dimension stable posets
Dimension theory for cyclically and cocyclically ordered sets
Direct product decomposition of zero-product-associative rings without nilpotent elements
Directoids with an antitone involution
We investigate -directoids which are bounded and equipped by a unary operation which is an antitone involution. Hence, a new operation can be introduced via De Morgan laws. Basic properties of these algebras are established. On every such an algebra a ring-like structure can be derived whose axioms are similar to that of a generalized boolean quasiring. We introduce a concept of symmetrical difference and prove its basic properties. Finally, we study conditions of direct decomposability of directoids...
Discriminator order algebras
We prove that an order algebra assigned to a bounded poset with involution is a discriminator algebra.
Distributive ordered sets and relative pseudocomplements
Brouwerian ordered sets generalize Brouwerian lattices. The aim of this paper is to characterize (α)-complete Brouwerian ordered sets in a manner similar to that used previously for pseudocomplemented, Stone, Boolean and distributive ordered sets. The sublattice (G(P)) in the Dedekind-Mac~Neille completion (DM(P)) of an ordered set (P) generated by (P) is said to be the characteristic lattice of (P). We can define a stronger notion of Brouwerianicity by demanding that both (P) and (G(P)) be Brouwerian....
Distributive partially ordered sets