Caractérisations axiomatiques de la distance de la différence symétrique entre des relations binaires
Completeness and modular cross-symmetry in normed linear spaces
Concept lattices associated with L-fuzzy W-contexts.
Concept lattices of quasiordered sets
Congruence kernels of distributive PJP-semilattices
A meet semilattice with a partial join operation satisfying certain axioms is a JP-semilattice. A PJP-semilattice is a pseudocomplemented JP-semilattice. In this paper we describe the smallest PJP-congruence containing a kernel ideal as a class. Also we describe the largest PJP-congruence containing a filter as a class. Then we give several characterizations of congruence kernels and cokernels for distributive PJP-semilattices.
Contexts and sublattices of concept lattices
Convex independence and the structure of clone-free multipartite tournaments
We investigate the convex invariants associated with two-path convexity in clone-free multipartite tournaments. Specifically, we explore the relationship between the Helly number, Radon number and rank of such digraphs. The main result is a structural theorem that describes the arc relationships among certain vertices associated with vertices of a given convexly independent set. We use this to prove that the Helly number, Radon number, and rank coincide in any clone-free bipartite tournament. We...
Convex isomorphisms of directed multilattices
By applying the solution of the internal direct product decomposition we investigate the relations between convex isomorphisms and direct product decompositions of directed multilattices.
Convex subsets of partial monounary algebras