Abstract

It is known that for a prime p≠2p\ne 2 there is the following natural description of the homology algebra of an abelian group H∗(A,Fp)≅Λ(A/p)⊗Γ(pA)H_*(A,\mathbb F_p)\cong Λ(A/p)\otimes 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)∨).H^*(A,\mathbb F_p)\cong Λ((A/p)^\vee)\otimes {\sf Sym}(({}_pA)^\vee). We prove that there are no such descriptions for p=2p=2 that `depend' only on A/2A/2 and 2A{}_2A but we provide natural descriptions of H∗(A,F2)H_*(A,\mathbb F_2) and H∗(A,F2)H^*(A,\mathbb F_2) that `depend' on A/2,A/2, 2A{}_2A and a linear map β~:2A→A/2.\tilde β:{}_2A\to A/2. Moreover, we prove that there is a filtration by subfunctors on Hn(A,F2)H_n(A,\mathbb F_2) whose quotients are Λn−2i(A/2)⊗Γi(2A)Λ^{n-2i}(A/2)\otimes Γ^i({}_2A) and that for finitely generated abelian groups there is a natural filtration on Hn(A,F2)H^n(A,\mathbb F_2) whose quotients are Λn−2i((A/2)∨)⊗Symi((2A)∨). Λ^{n-2i}((A/2)^\vee)\otimes {\sf Sym}^i(({}_2A)^\vee).

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