This is a preview of subscription content, log in via an institution to check access.
References
Papakyriakopoulos, C. D.: On Dehn's lemma and asphericity of knots. Annals of Math.66, 1–26 (1957).
Spanier, E. H.: Algebraic topology. New York: McGraw Hill 1966.
Specker, E.: Die erste Cohomologiegruppe von Überlagerungen und Homotopieeigenschaften dreidimensionaler Mannigfaltigkeiten. Comm. Math. Helv.23, 303–333 (1949).
Stallings, J. R.: A topological proof of Grusko's Theorem. Math. Zeit.90, 1–8 (1965).
Stallings, J. R.: Grusko's theorem II: Kneser's conjecture. Notices of A.M.S. No. 559-165, 531–532 (1959).
Stallings, J. R.: Lectures on polyhedral topology. Tata Institute of Fundamental Research, Bombay, 1968.
Whitehead, J. H. C.: On 2-spheres in 3-manifolds. Bull. of A.M.S.64, 161–166 (1958).
Whitehead, J. H. C.: On finite cocycles and the sphere theorem. Coll. Math.6, 271–281 (1958).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Swarup, G.A. On embedded spheres in 3-manifolds. Math. Ann. 203, 89–102 (1973). https://doi.org/10.1007/BF01431437
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF01431437