On the universal covering space and the fundamental group
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- by C. W. Saalfrank PDF
- Proc. Amer. Math. Soc. 4 (1953), 650-653 Request permission
References
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H. Seifert and W. Thelfall, Lehrbuch der Topologie, Leipzig and Berlin, 1934.
- Alfred M. Peiser, Covering mappings, Duke Math. J. 10 (1943), 305–307. MR 8134 K. Borsuk, Sur les rétractes, Fund. Math. vol. 17 (1931) pp. 152-170.
- C. W. Saalfrank, Retraction properties for normal Haussdorff spaces, Fund. Math. 36 (1949), 93–108. MR 31710, DOI 10.4064/fm-36-1-93-108
Additional Information
- © Copyright 1953 American Mathematical Society
- Journal: Proc. Amer. Math. Soc. 4 (1953), 650-653
- MSC: Primary 56.0X
- DOI: https://doi.org/10.1090/S0002-9939-1953-0056918-6
- MathSciNet review: 0056918