-Lindelöf spaces.
We study when a topological space has a weaker connected topology. Various sufficient and necessary conditions are given for a space to have a weaker Hausdorff or regular connected topology. It is proved that the property of a space of having a weaker Tychonoff topology is preserved by any of the free topological group functors. Examples are given for non-preservation of this property by “nice” continuous mappings. The requirement that a space have a weaker Tychonoff connected topology is rather...
Given a metric continuum and a positive integer , denotes the hyperspace of all nonempty subsets of with at most points endowed with the Hausdorff metric. For , denotes the set of elements of containing and denotes the quotient space obtained from by shrinking to one point set. Given a map between continua, denotes the induced map defined by . Let , we shall consider the induced map in the natural way . In this paper we consider the maps , , for some and for...