A proof of the nonretractibility of a cell onto its boundary
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- by Morris W. Hirsch
- Proc. Amer. Math. Soc. 14 (1963), 364-365
- DOI: https://doi.org/10.1090/S0002-9939-1963-0145502-8
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References
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- L. S. Pontryagin, Smooth manifolds and their applications in homotopy theory, American Mathematical Society Translations, Ser. 2, Vol. 11, American Mathematical Society, Providence, R.I., 1959, pp. 1–114. MR 0115178
- Arthur Sard, The measure of the critical values of differentiable maps, Bull. Amer. Math. Soc. 48 (1942), 883–890. MR 7523, DOI 10.1090/S0002-9904-1942-07811-6
Bibliographic Information
- © Copyright 1963 American Mathematical Society
- Journal: Proc. Amer. Math. Soc. 14 (1963), 364-365
- MSC: Primary 54.78
- DOI: https://doi.org/10.1090/S0002-9939-1963-0145502-8
- MathSciNet review: 0145502