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Some topological and cardinal properties of the space of permutation degree

Ljubiša D. R. KočinacUniversity of Niš, Faculty of Sciences and Mathematics, Niš, SerbiaF. G. MukhamadievNational University of Uzbekistan named after Mirzo Ulugbek, Tashkent, UzbekistanAnvar K. SadullaevYeoju Technical Institute in Tashkent, Tashkent, Uzbekistan
Filomatjournal2022en
ABI

Аннотация

In this paper, we prove a few facts and some cardinal properties of the space of permutation degree introduced in [6]. More precisely, we prove that if the productXn is a Lindel?f (resp. locally Lindel?f) space, then the space SPnX is also Lindel?f (resp. locally Lindel?f). We also prove that if the product Xn is a weakly Lindel?f (resp. weakly locally Lindel?f) space, then the space SPnX is also weakly Lindel?f (resp. weakly locally Lindel?f). Moreover, we investigate the preservation of the network weight, ?-character and local density of topological spaces by the functor of G-permutation degree. It is proved that this functor preserves the network weight, ?-character and local density of infinite topological T1-spaces.

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