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Dec 22, 2015 at 5:19 vote accept Shiquan Ren
Nov 12, 2015 at 12:28 comment added Gabriel C. Drummond-Cole A common choice that is $\Sigma_k$-equivariant is to fix a homeomorphism $\phi$ between $S'$ and $S\backslash \mathrm{disk}$ and a fixed point $q$ in $\mathrm{disk}\backslash \mathrm{point}$ and then take the configuration $(p_1,\cdots p_k)$ to $(\phi(p_1),\cdots, \phi(p_k),q)$.
Nov 12, 2015 at 12:23 history answered Tom Goodwillie CC BY-SA 3.0