It is known that for a prime p ≠ = 2, there is the following natural description of the homology algebra of an Abelian group H*(A, 𝔽p) ≅ Λ(A/p)⊗Γ(pA), and for finitely generated Abelian groups there is the following description of the cohomology algebra of H*(A, 𝔽p) ≅ Λ((A/p)∨)⊗Sym((pA)∨). It is proved that for p = 2, there are no such descriptions “depending” on A/2 and 2A only. Moreover, natural descriptions of H*(A, 𝔽2) and H*(A, 𝔽2), “depending” on A/2, 2A, and a linear map \( \overline{\beta} \): 2A → A/2 are presented. It is also proved that there is a filtration by subfunctors on Hn(A, 𝔽2), whose quotients are Λn−2i(A/2)⊗Γi(2A), and there is a natural filtration on Hn(A, 𝔽2) for finitely generated Abelian groups, whose quotients are Λn−2i((A/2)∨) ⊗ Symi((2A)∨).
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Dedicated to Alexander Generalov on the occasion of his 70th birthday
Published in Zapiski Nauchnykh Seminarov POMI, Vol. 484, 2019, pp. 72–85.
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Ivanov, S.O., Zaikovskii, A.A. MOD-2 (CO)homology of an Abelian Group. J Math Sci 252, 794–803 (2021). https://doi.org/10.1007/s10958-021-05200-0
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DOI: https://doi.org/10.1007/s10958-021-05200-0