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Totally Brown subsets of the Golomb space and the Kirch space

José del Carmen Alberto-DomínguezGerardo AcostaGerardo Delgadillo-Piñón — 2022

Commentationes Mathematicae Universitatis Carolinae

A topological space X is totally Brown if for each n { 1 } and every nonempty open subsets U 1 , U 2 , ... , U n of X we have cl X ( U 1 ) cl X ( U 2 ) cl X ( U n ) . Totally Brown spaces are connected. In this paper we consider the Golomb topology τ G on the set of natural numbers, as well as the Kirch topology τ K on . Then we examine subsets of these spaces which are totally Brown. Among other results, we characterize the arithmetic progressions which are either totally Brown or totally separated in ( , τ G ) . We also show that ( , τ G ) and ( , τ K ) are aposyndetic. Our results...

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