Timeline for What space classifies bundles of K(pi,1)'s?
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| Jul 18, 2014 at 11:20 | comment | added | Stefan Hamcke | Hello! I'm reading your book Nonabelian algebraic topology and encountered the notion of a crossed module over a groupoid in section 6.2, where the first condition is that $$\mu(x^a)=\mu(x)^a$$ However, the action of $a$ is on elements in $M$. Am I right in assuming that this is just $$\mu(x^a)=-a+\mu(x)+a$$ similar to the case of groups ? | |
| Feb 16, 2013 at 11:49 | history | edited | Ronnie Brown | CC BY-SA 3.0 |
correction to give \pi_2
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| Feb 15, 2013 at 11:03 | history | answered | Ronnie Brown | CC BY-SA 3.0 |