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Closedness of certain classes of functions in the topology of uniform convergence

100%

Kohli J. K. , Aggarwal J.

2012

tom Vol. 45, nr 4

947-952

In this paper, closedness of certain classes of functions in VX in the topology of uniform convergence is observed. In particular, we show that the function spaces SC(X, Y) of quasi continuous (…) functions, (…) (X, Y ) of (…)-continuous functions and L(X,Y) of cl-supercontinuous functions are closed in YX in the topology of uniform convergence.

Recognizing the topologies of spaces of metrics with the topology of uniform convergence

75%

Koshino K.

Bulletin of the Polish Academy of Sciences. Mathematics

2022

tom Vol. 70, no. 2

165--171

Given a metrizable space X of density κ, we study the topological structure of the space PM(X) of continuous bounded pseudometrics on X, which is endowed with the topology of uniform convergence. We prove that PM(X) is homeomorphic to [0,1)κ(κ−1)/2 if X is finite, to ℓ2(2<κ) if X is infinite and generalized compact, and to ℓ2(2κ) if X is not generalized compact. We also show that for an infinite σ-compact metrizable space X, the space M(X)⊂PM(X) of continuous bounded metrics on X and the space AM(X)⊂M(X) of bounded admissible metrics on X are homeomorphic to ℓ2 if X is compact, and to ℓ∞ if X is not compact.

On ∞-entropy points in real analysis

63%

Korczak-Kubiak E. , Loranty A. , Pawlak R. J.

2014

tom Vol. 34, no. 4

799--812

We will consider ∞-entropy points in the context of the possibilities of approximation mappings by the functions having ∞-entropy points and belonging to essential (from the point of view of real analysis theory) classes of functions: almost continuous, Darboux Baire one and approximately continuous functions.