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arXiv · 2508.11841

Homological Description of Equivariant Geometric Bordism

Bo Chen·Hao Li·Zhi Lü
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Abstract

Using the evenness criterion in \cite{LCLS} and duality principle in \cite{CLT}, we construct a finite chain complex $\mathfrak{B}_{\bullet}((\mathbb{Z}_2)^k)$ built from the universal complex $X((\mathbb{Z}_2)^k)$ and its links. We then show that the equivariant unoriented bordism group $\mathcal{Z}_{k+1}((\mathbb{Z}_2)^k)$ of all $(k+1)$-dimensional smooth closed connected manifolds with effective $(\mathbb{Z}_2)^k$-actions fixing isolated points, is naturally isomorphic to $H_{k-2}(\mathfrak{B}_{\bullet}((\mathbb{Z}_2)^k);\mathbb{Z}_2)$. The vertical spectral sequence associated with the natural double-complex structure on $\mathfrak{B}_\bullet((\mathbb{Z}_2)^k)$ collapses at $E^3$, yielding an explicit formula for $\dim_{\mathbb{Z}_2}\mathcal{Z}_{k+1}((\mathbb{Z}_2)^k)$ for every $k$.

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Bo Chen, Hao Li, Zhi Lü. 2025-08-15. Homological Description of Equivariant Geometric Bordism. https://arxiv.org/abs/2508.11841

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