scientific article

zbMath0697.20001MaRDI QIDQ4040880

Publication date: 5 June 1993

Title: zbMATH Open Web Interface contents unavailable due to conflicting licenses.

presentations decision theory HNN extensions fundamental group free products free groups groups acting on trees combinatorial group theory covering spaces amalgamated free products generators and relations small-cancellation theory Van Kampen's theorem Grushko's theorem 2- dimensional CW-complexes Schreier and Kurosh subgroup theorems

Mathematics Subject Classification ID

Covering spaces and low-dimensional topology (57M10) Subgroup theorems; subgroup growth (20E07) Generators, relations, and presentations of groups (20F05) Fundamental group, presentations, free differential calculus (57M05) Free products of groups, free products with amalgamation, Higman-Neumann-Neumann extensions, and generalizations (20E06) Word problems, other decision problems, connections with logic and automata (group-theoretic aspects) (20F10) Research exposition (monographs, survey articles) pertaining to manifolds and cell complexes (57-02) Research exposition (monographs, survey articles) pertaining to algebraic topology (55-02) Research exposition (monographs, survey articles) pertaining to group theory (20-02)

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