Normality in function spaces
On -spaces and -spaces
In this note we study the relation between -spaces and -spaces and prove that a -space with a -hereditarily closure-preserving -network consisting of compact subsets is a -space, and that a -space with a point-countable -network consisting of compact subsets need not be a -space.
On -metrizable spaces
On the foundations of k-group theory [Book]
Ordinal invariants in topology II. Sequential order of compactifications
Partition continue de l'unite et C-repletion.
Power stability of k-spaces and compactness
Products as reflections
Products of convergence properties
Products of -spaces, and questions
As is well-known, every product of a locally compact space with a -space is a -space. But, the product of a separable metric space with a -space need not be a -space. In this paper, we consider conditions for products to be -spaces, and pose some related questions.
Products of quotients and of -spaces
Produit topologique, produit tensoriel et -replétion
Quotients of k-semigroups.
Some characterizations of paracompactness in k-spaces
Some Questions on Metrizability
Sur la transformation de Dirac d'un espace à génération compacte
Sur les ouverts des CW-complexes et les fibrés de Serre
M. Steinberger et J. West ont prouvé dans [7] qu’un fibré de Serre p:E → B entre CW-complexes a la propriété de relèvement des homotopies par rapport aux k-espaces. Malheureusement, leur démonstration contient une légère erreur. Ils affirment que certains ensembles (notés U et ) sont des CW-complexes car ce sont des ouverts de CW-complexes. Ceci est généralement faux, et notre premier objectif dans cette note est de donner des exemples d’ouverts de CW-complexes n’admettant aucune décomposition...
Tanaka spaces and products of sequential spaces
We consider properties of Tanaka spaces (introduced in Mynard F., More on strongly sequential spaces, Comment. Math. Univ. Carolin. 43 (2002), 525–530), strongly sequential spaces, and weakly sequential spaces. Applications include product theorems for these types of spaces.
Topologically maximal convergences, accessibility, and covering maps
Topologically maximal pretopologies, paratopologies and pseudotopologies are characterized in terms of various accessibility properties. Thanks to recent convergence-theoretic descriptions of miscellaneous quotient maps (in terms of topological, pretopological, paratopological and pseudotopological projections), the quotient characterizations of accessibility (in particular, those of G. T. Whyburn and F. Siwiec) are shown to be instances of a single general theorem. Convergence-theoretic characterizations...
Two-fold theorem on Fréchetness of products
A refined common generalization of known theorems (Arhangel’skii, Michael, Popov and Rančin) on the Fréchetness of products is proved. A new characterization, in terms of products, of strongly Fréchet topologies is provided.