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The common division topology on

José del Carmen Alberto-Domínguez, Gerardo Acosta, Maira Madriz-Mendoza (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 a topology τ S on the set of natural numbers. We then present properties of the topological space ( , τ S ) , some of them involve the closure of a set with respect to this topology, while others describe subsets which are either totally Brown or totally separated. Our theorems generalize results proved by P. Szczuka in 2013, 2014, 2016 and by...

Totally Brown subsets of the Golomb space and the Kirch space

José del Carmen Alberto-Domínguez, Gerardo Acosta, Gerardo 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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