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- W4297310725 abstract "In the general context of functorial topologies, we prove that in the lattice of all group topologies on an abelian group, the infimum between the Bohr topology and the natural topology is the profinite topology. The profinite topology and its connection to other functorial topologies is the main objective of the paper. We are particularly interested in the poset C(G) of all finite-index subgroups of an abelian group G, since it is a local base for the profinite topology of G. We describe various features of the poset C(G) (its cardinality, its cofinality, etc.) and we characterize the abelian groups G for which C(G){G} is cofinal in the poset of all subgroups of G ordered by inclusion. Finally, for pairs of functorial topologies T, S we define the equalizer E(T,S), which permits to describe relevant classes of abelian groups in terms of functorial topologies." @default.
- W4297310725 created "2022-09-28" @default.
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- W4297310725 date "2011-03-23" @default.
- W4297310725 modified "2023-09-23" @default.
- W4297310725 title "Functorial topologies and finite-index subgroups of abelian groups" @default.
- W4297310725 doi "https://doi.org/10.48550/arxiv.1103.4565" @default.
- W4297310725 hasPublicationYear "2011" @default.
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