For every n, the equivariant unoriented bordism group Z_{n+1}(Z_2^n) is isomorphic to H_{n-2}(B;Z_2) of a new chain complex B, giving a closed-form dimension formula.
Equivariant geometric bordism, representation, labelled graph
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This paper focuses on the following problem: {\em what $G_k$-representation polynomials in Conner--Floyd $G_k$-representation algebra arise as fixed point data of $G_k$-manifolds?} where $G_k=(\mathbb{Z}_2)^k$. Using the idea of the GKM theory, we construct a $G_k$-labelled graph from a smooth closed manifold with an effective $G_k$-action fixing a finite set. Then we give an answer to above mentioned problem through two approaches: $G_k$-labelled graphs and $G_k$-representation theory. As an application, we give a complete classification of all 4-dimensional smooth closed manifolds with an effective $G_3$-action fixing a finite set up to equivariant unoriented bordism.
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On the homology description of equivariant unoriented bordism groups
For every n, the equivariant unoriented bordism group Z_{n+1}(Z_2^n) is isomorphic to H_{n-2}(B;Z_2) of a new chain complex B, giving a closed-form dimension formula.