Ultrafiltres sur un espace spectral - Anneaux de Baer - Anneaux a spectre minimal compact.
Ultraparacompactness in certain Pixley-Roy hyperspaces
Uncountably many wild knots whose cyclic branched covering are S3.
There is a disk in S3 whose interior is PL embedded and whose boundary has a tame Cantor set of locally wild points, such that the n-fold cyclic coverings of S3 branched over the boundary of the disk are all S3. An uncountable set of inequivalent wild knots with these properties is exhibited.
Under an inductivity condition the stalks of the covering space of a presheaf are isomorphic (inductive and projective modifications of closurations of presheaves)
Unified characterization of exponential objects in TOP, PRTOP and PARATOP
Unified spaces and singular sets for mappings of locally compact spaces
Uniform quotients of metric spaces
Uniform quotients of metrizable spaces
Uniformities, Hyperspaces, and Normality.
Uniformly movable compact spaces and their algebraic properties
Universal reparametrization of a family of cycles : a new approach to meromorphic equivalence relations
We study analytic families of non-compact cycles, and prove there exists an analytic space of finite dimension, which gives a universal reparametrization of such a family, under some assumptions of regularity. Then we prove an analogous statement for meromorphic families of non-compact cycles. That is a new approach to Grauert’s results about meromorphic equivalence relations.
Universally Kuratowski–Ulam spaces
We introduce the notions of Kuratowski-Ulam pairs of topological spaces and universally Kuratowski-Ulam space. A pair (X,Y) of topological spaces is called a Kuratowski-Ulam pair if the Kuratowski-Ulam Theorem holds in X× Y. A space Y is called a universally Kuratowski-Ulam (uK-U) space if (X,Y) is a Kuratowski-Ulam pair for every space X. Obviously, every meager in itself space is uK-U. Moreover, it is known that every space with a countable π-basis is uK-U. We prove the following: ...
Upper semicontinuous decompositions of convex metric spaces
Using maximal ideals in the classification of MV-algebras
Using the generic interval