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- W2016403107 abstract "Let X be a connected 2-dimensional CW complex. This note reproves from a very simple point of view two classical theorems of H. Hopf relating the homology of the fundamental group yr = qr1(X) of X and the Hurewicz map on sr2(X). This point of view also allows the dual theorems to be proved. If Xr is a finite group, a new interpretation is given for Hi(si; Z) (i = 2, 3) in terms of 7T2(X)." @default.
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- W2016403107 date "1976-02-01" @default.
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- W2016403107 title "On the second homotopy module of two-dimensional CW complexes" @default.
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- W2016403107 doi "https://doi.org/10.1090/s0002-9939-1976-0410739-6" @default.
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