A Borsuk-Ulam theorem for $(\mathbb Z_p)^k$-actions on products of (mod $p$) homology spheres

Details A Borsuk-Ulam theorem for $(\mathbb Z_p)^k$-actions on products of (mod $p$) homology spheres A Borsuk-Ulam theorem for $(\mathbb Z_p)^k$-actions on products of (mod $p$) homology spheres

2005-10-05

arxiv.org/abs/math/0510086v1

Mathematics

Geometric Topology

10 pages

Scientific paper

It is proved that for a product action of $(\mathbb Z_p)^k$ on a product of (mod p) homology spheres $N^{n_1}\times...\times N^{n_k}$, where all $n_i$'s are assumed to be odd if $p$ is odd, and any continuous map $f\colon N^{n_1}\times...\times N^{n_k}\to \mathbb R^m$ the set $A(f)=\{x\in N^{n_1}\times...\times N^{n_k}| f(x)=f(gx) \forall g\in(\mathbb Z_p)^k\}$ has dimension at least $n_1+...+n_k-m(p^k-1)$, provided $n_i\ge mp^{i-1}(p-1)$ for all $i (1\le i\le k)$. Moreover, if $n_i\ge mp^{k-1}(p-1)$ for all $i(1\le i\le k)$ then the free action $\mu$ can be assumed arbitrary.

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