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Homotopy Classification of Mappings of a 4-Dimensional Complex into a 2-Dimensional Sphere
Published online by Cambridge University Press: 22 January 2016
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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].
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- Copyright © Editorial Board of Nagoya Mathematical Journal 1953
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