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On linear functorial operators extending pseudometrics

Taras O. Banakh, Oleg Pikhurko (1997)

Commentationes Mathematicae Universitatis Carolinae

For a functor F I d on the category of metrizable compacta, we introduce a conception of a linear functorial operator T = { T X : P c ( X ) P c ( F X ) } extending (for each X ) pseudometrics from X onto F X X (briefly LFOEP for F ). The main result states that the functor S P G n of G -symmetric power admits a LFOEP if and only if the action of G on { 1 , , n } has a one-point orbit. Since both the hyperspace functor exp and the probability measure functor P contain S P 2 as a subfunctor, this implies that both exp and P do not admit LFOEP.

On linear operators and functors extending pseudometrics

C. Bessaga (1993)

Fundamenta Mathematicae

For some pairs (X,A), where X is a metrizable topological space and A its closed subset, continuous, linear (i.e., additive and positive-homogeneous) operators extending metrics for A to metrics for X are constructed. They are defined by explicit analytic formulas, and also regarded as functors between certain categories. An essential role is played by "squeezed cones" related to the classical cone construction. The main result: if A is a nondegenerate absolute neighborhood retract for metric spaces,...

On locales whose countably compact sublocales have compact closure

Themba Dube (2023)

Mathematica Bohemica

Among completely regular locales, we characterize those that have the feature described in the title. They are, of course, localic analogues of what are called cl -isocompact spaces. They have been considered in T. Dube, I. Naidoo, C. N. Ncube (2014), so here we give new characterizations that do not appear in this reference.

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