DETERMINATION OF THE 2ND HOMOLOGY AND COHOMOLOGY GROUPS OF A SPACE BY MEANS OF HOMOTOPY INVARIANTS

被引:19
作者
EILENBERG, S
MACLANE, S
机构
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D O I
10.1073/pnas.32.11.277
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
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页码:277 / 280
页数:4
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