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Publication:3027238
zbMath0625.20041MaRDI QIDQ3027238
Publication date: 1987
Title: zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Classification of homotopy type (55P15) Extensions, wreath products, and other compositions of groups (20E22) Fundamental group, presentations, free differential calculus (57M05) Free products of groups, free products with amalgamation, Higman-Neumann-Neumann extensions, and generalizations (20E06) Groupoids (i.e. small categories in which all morphisms are isomorphisms) (20L05)
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