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 | |
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]]. | ||
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| + | Find nice models for $\underline{E} SL_2(\Zz)$. | ||
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== References == | == References == | ||
Revision as of 23:22, 27 August 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 
.
