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The second homology group of group; relations among commutators. (English) Zbl 0047.25703


MSC:

20J05 Homological methods in group theory
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References:

[1] Samuel Eilenberg and Saunders MacLane, Relations between homology and homotopy groups of spaces, Ann. of Math. (2) 46 (1945), 480 – 509. · Zbl 0061.40702 · doi:10.2307/1969165
[2] Samuel Eilenberg and Saunders MacLane, Cohomology theory in abstract groups. I, Ann. of Math. (2) 48 (1947), 51 – 78. · Zbl 0029.34001 · doi:10.2307/1969215
[3] Heinz Hopf, Fundamentalgruppe und zweite Bettische Gruppe, Comment. Math. Helv. 14 (1942), 257 – 309 (German). · Zbl 0027.09503 · doi:10.1007/BF02565622
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