Classifying spaces for proper group actions (Ex)
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− | Let $D_{\infty} = \Zz \rtimes \Zz/2 = \Zz/2 \ast \Zz/2$ be the infinite dihedral | + | # Let $D_{\infty} = \Zz \rtimes \Zz/2 = \Zz/2 \ast \Zz/2$ be the infinite dihedral |
group. Show that $\Rr$ with the obvious $D_{\infty}$-action is a model for $\underline{E}D_{\infty}$; see [[Classifying spaces for families of subgroups]]. | group. Show that $\Rr$ with the obvious $D_{\infty}$-action is a model for $\underline{E}D_{\infty}$; see [[Classifying spaces for families of subgroups]]. | ||
+ | # Find nice models for $\underline{E} SL_2(\Zz)$. | ||
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== References == | == References == |
Revision as of 14:41, 29 July 2013
- Let be the infinite dihedral
group. Show that with the obvious -action is a model for ; see Classifying spaces for families of subgroups.
- Find nice models for .