
doi: 10.1007/bf02567612
This work unifies and extends many generalizations of Borsuk's theorem. The authors prove an equivariant version of the Kuratowski-Dugundji Theorem. In order to do this, they show the existence of a (quasi)- fundamental domain for any free action of a compact Lie group on a metric space \(X\). Then for \(G\) finite and \(\Psi, \varphi : M \to S\) a pair of equivariant maps where \(M\) is a manifold of the same dimension \(n\) as the sphere \(S\), they show that \(\deg \Psi - \deg \varphi \equiv 0 \pmod {\text{GCD} \{|G/H_i |\}}\) under certain hypotheses. Finally they show that \(n - k\) is a lower bound for the genus of \(S\smallsetminus B\) where \(S\smallsetminus B\) is a free \(G\)-subspace and \(B\) the image of a smooth mapping of a \(k\)-dimensional compact manifold.
Compact Lie groups of differentiable transformations, Finite transformation groups, Article, 510.mathematics, free action of a compact Lie group on a metric space, Fixed points and coincidences in algebraic topology, fundamental domain, equivariant maps, Finite groups of transformations in algebraic topology (including Smith theory), Equivariant homotopy theory in algebraic topology
Compact Lie groups of differentiable transformations, Finite transformation groups, Article, 510.mathematics, free action of a compact Lie group on a metric space, Fixed points and coincidences in algebraic topology, fundamental domain, equivariant maps, Finite groups of transformations in algebraic topology (including Smith theory), Equivariant homotopy theory in algebraic topology
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