How large are left exact functors?
Intersections of prescribed power, type, or measure
Lindelöf indestructibility, topological games and selection principles
Arhangel’skii proved that if a first countable Hausdorff space is Lindelöf, then its cardinality is at most . Such a clean upper bound for Lindelöf spaces in the larger class of spaces whose points are has been more elusive. In this paper we continue the agenda started by the second author, [Topology Appl. 63 (1995)], of considering the cardinality problem for spaces satisfying stronger versions of the Lindelöf property. Infinite games and selection principles, especially the Rothberger property,...
Methode A Resoudre Des Relations Dont Les Resolutions Appartiennent A Un Ensemble Fini
Méthode à résoudre des relations dont les résolutions appartiennent à un ensemble fini.
Na množinovú tému
On extension of the group operation over the Čech-Stone compactification
The convolution of ultrafilters of closed subsets of a normal topological group is considered as a substitute of the extension onto of the group operation. We find a subclass of ultrafilters for which this extension is well-defined and give some examples of pathologies. Next, for a given locally compact group and its dense subgroup , we construct subsets of β algebraically isomorphic to . Finally, we check whether the natural mapping from β onto β is a homomorphism with respect to the extension...
On generalized fuzzy relation equations: necessary and sufficient conditions for the existence of solutions
On interpretability in set theories
On interpretability in set theories. II.
On minimal separating Boolean algebras.
On normalization of proofs in set theory [Book]
On Supernormal Ehresmann-Dedecker Universes.
On the generators of T-indistinguishability operator.
The structure of the generators' set of a T-indistinguishability operator is analyzed. A suitable characterization of such generators is given. T-indistinguishability operators generated by a single fuzzy set, in the sense of the representation problem, are studied.
Outer measure on boolean algebras
Partition generation of scales
Powers and generalized cardinal numbers for HCH-objects --- basic notions.
Revealments
Roughness in -graphs
-graphs are a type of graphs associated to groups, which were proposed by A. Bretto and A. Faisant (2005). In this paper, we first give some theorems regarding -graphs. Then we introduce the notion of rough -graphs and investigate some important properties of these graphs.
Set theory and category theory: Two rival siblings and their relations with the foundations of mathematics. (La théorie des ensembles et la théorie des catégories: Présentation de deux soeurs ennemies du point de vue de leurs relations avec les fondements des mathématiques.)