Homotopy Classification of Mappings of a 4-Dimensional Complex into a 2-Dimensional Sphere
- 1 February 1953
- journal article
- research article
- Published by Cambridge University Press (CUP) in Nagoya Mathematical Journal
- Vol. 5, 127-144
- https://doi.org/10.1017/s0027763000015506
Abstract
Steenrod [1] solved the problem of enumerating the homotopy classes of maps of an (n + 1)-complex K into an n-sphere Sn utilizing the cup-i-product, the far-reaching generalization of the Alexander-Čech-Whitney cup product [7] and the Pontrjagin *-product [5].Keywords
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