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Nov 28, 2012 at 20:16 comment added David Spivak Thanks Karol. I made the obvious edit to $\Sigma_G\Delta_F\to\Sigma_x$. I have another question, namely for conditions on $F$ whereby the map $\Delta_F\to\Delta_G\Sigma_x$ is an isomorphism. I'm going to try to adapt your technology to that situation.
Nov 28, 2012 at 19:01 vote accept David Spivak
Feb 6, 2013 at 19:01
Nov 28, 2012 at 18:25 history answered Karol Szumiło CC BY-SA 3.0