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I -Lindelöf spaces.

Al-Zoubi, Khalid, Al-Nashef, Bassam (2004)

International Journal of Mathematics and Mathematical Sciences

In quest of weaker connected topologies

Mihail G. Tkachenko, Vladimir Vladimirovich Tkachuk, Vladimir Vladimirovich Uspenskij, Richard Gordon Wilson (1996)

Commentationes Mathematicae Universitatis Carolinae

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...

Induced mappings on hyperspaces F n K ( X )

Enrique Castañeda-Alvarado, Roberto C. Mondragón-Alvarez, Norberto Ordoñez (2024)

Commentationes Mathematicae Universitatis Carolinae

Given a metric continuum X and a positive integer n , F n ( X ) denotes the hyperspace of all nonempty subsets of X with at most n points endowed with the Hausdorff metric. For K F n ( X ) , F n ( K , X ) denotes the set of elements of F n ( X ) containing K and F n K ( X ) denotes the quotient space obtained from F n ( X ) by shrinking F n ( K , X ) to one point set. Given a map f : X Y between continua, f n : F n ( X ) F n ( Y ) denotes the induced map defined by f n ( A ) = f ( A ) . Let K F n ( X ) , we shall consider the induced map in the natural way f n , K : F n K ( X ) F n f ( K ) ( Y ) . In this paper we consider the maps f , f n , f n , K for some K F n ( X ) and f n , K for...

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