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Subgroups of free topological groups and free topological products of topological groups. (English) Zbl 0304.22003

MSC:
22A05 Structure of general topological groups
22A99 Topological and differentiable algebraic systems
20L05 Groupoids (i.e. small categories in which all morphisms are isomorphisms)
20E05 Free nonabelian groups
20E06 Free products of groups, free products with amalgamation, Higman-Neumann-Neumann extensions, and generalizations
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