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A topological proof of Grushko’s theorem on free products. (English) Zbl 0135.04603

group theory
Full Text: DOI EuDML
[1] Grushko, I.: On the bases of a free product of groups. Mat. Sbornik8, 169-182 (1940).
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[3] Kneser, H.: Geschlossene Flächen in dreidimensionalen Mannigfaltigkeiten. Jahresb. Deutsch. Math.-Ver.38, 248-260 (1929). · JFM 55.0311.03
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[6] Stallings, J.R.: Some topological proofs and extensions of Gru?ko’s theorem. Thesis Princeton University 1959.
[7] Stallings, J.R.: Manifolds whose fundamental groups are free products (to appear). · Zbl 0157.05302
[8] Kampen, E.R. van: On the connection between the fundamental groups of some related spaces. Amer. J. Math.55, 261-267 (1933). · Zbl 0006.41503
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