Jeu de Choquet
Joins and intersections.
Jordan's curve theorem.
Kennzeichnung von Bogen
Krasinkiewicz maps from compacta to polyhedra
We prove that the set of all Krasinkiewicz maps from a compact metric space to a polyhedron (or a 1-dimensional locally connected continuum, or an n-dimensional Menger manifold, n ≥ 1) is a dense -subset of the space of all maps. We also investigate the existence of surjective Krasinkiewicz maps from continua to polyhedra.
-spaces
In this paper -spaces are introduced and studied. They are a common generalization of Lindelöf spaces and -spaces researched by E. Michael. A space is called an -space if, whenever is a closed cover of with compact, then or is Lindelöf. Semi-strong -spaces and strong -spaces are also defined and investigated. It is demonstrated that the three spaces are different and have interesting properties and behaviors.
La categoría-base de los abiertos regulares de un espacio topológico.
La dimension de la frontière d'un ensemble analytique dans son saturé par une application
Soit une application analytique propre entre des ouverts de , soit un sous-ensemble analytique de et soit . On donne des conditions pour que soit de codimension 1 dans .
Large free set
Lattice of -compact topological spaces
Left translations of compact semilattices and generalizations
Left-separated spaces: a comment to a paper of M. G. Tkačenko
Lelek fan from a projective Fraïssé limit
We show that a natural quotient of the projective Fraïssé limit of a family that consists of finite rooted trees is the Lelek fan. Using this construction, we study properties of the Lelek fan and of its homeomorphism group. We show that the Lelek fan is projectively universal and projectively ultrahomogeneous in the class of smooth fans. We further show that the homeomorphism group of the Lelek fan is totally disconnected, generated by every neighbourhood of the identity, has a dense conjugacy...
Les images multivoques d'un segment
Level sets of uniform quotient mappings from Rn to R do not need to be locally connected.
We give an example of a uniform quotient map from R2 to R which has non-locally connected level sets.
Levels in algebra and topology.
Limit of approximate inverse system of totally regular continua is totally regular.
Limiting subcontinua and Whitney maps of tree-like continua
Linear and -linear betweenness spaces
Local cohomological properties of homogeneous ANR compacta
In accordance with the Bing-Borsuk conjecture, we show that if X is an n-dimensional homogeneous metric ANR continuum and x ∈ X, then there is a local basis at x consisting of connected open sets U such that the cohomological properties of Ū and bd U are similar to the properties of the closed ball ⁿ ⊂ ℝⁿ and its boundary . We also prove that a metric ANR compactum X of dimension n is dimensionally full-valued if and only if the group Hₙ(X,X∖x;ℤ) is not trivial for some x ∈ X. This implies that...