Gao 2Man

Singapore

I am a graduate student in algebraic topology under Wu jie at the National University of Singapore.

Why is the classifying space of the natural numbers homotopy equivalent to the circle?

at.algebraic-topology asked Apr 14, 2012 at 6:19

combinatorics sequences-and-series algebraic-topology asked Jul 29, 2012 at 10:28

at.algebraic-topology gn.general-topology asked Mar 6, 2011 at 5:32

at.algebraic-topology gn.general-topology asked Feb 22, 2011 at 6:48

at.algebraic-topology asked May 9, 2012 at 14:09

abstract-algebra asked Sep 10, 2012 at 3:30