Cohomology algebra of orbit spaces of free involutions on lens spaces

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  • Singh Mahender
    Indian Institute of Science Education and Research (IISER) Mohali

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Let G be a group acting continuously on a space X and let X/G be its orbit space. Determining the topological or cohomological type of the orbit space X/G is a classical problem in the theory of transformation groups. In this paper, we consider this problem for cohomology lens spaces. Let X be a finitistic space having the mod 2 cohomology algebra of the lens space Lp2m−1 (q1,…,qm). Then we classify completely the possible mod 2 cohomology algebra of orbit spaces of arbitrary free involutions on X. We also give examples of spaces realizing the possible cohomology algebras. In the end, we give an application of our results to non-existence of ℤ2-equivariant maps $¥mathbb{S}$n → X.

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