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Transactions of the American Mathematical Society

ISSN 1088-6850(online) ISSN 0002-9947(print)



Additive cohomology operations

Author: Jeanne Duflot
Journal: Trans. Amer. Math. Soc. 316 (1989), 311-325
MSC: Primary 55S05
MathSciNet review: 942425
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Abstract: The bigraded group $ \{ {H_i}({\Sigma _n},{\mathbf{Z}}/p)\} $ becomes a Hopf algebra, if multiplication is induced by restriction, and comultiplication is induced by transfer. Using Steenrod's method of considering elements of this bigraded group as $ \bmod {\text{ - }}p$ cohomology operations, the primitives of this Hopf algebra correspond to additive cohomology operations. In this paper we use the results known about the homology and cohomology of the symmetric groups and the operations they induce in $ \bmod {\text{ - }}p$ cohomology to write down two (additive) bases of the bigraded vector space of primitives of the above Hopf algebra.

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Article copyright: © Copyright 1989 American Mathematical Society

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