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Gao 2Man

I am a graduate student in algebraic topology under Wu jie at the National University of Singapore.
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20 Why is the classifying space of the natural numbers homotopy equivalent to the circle? Apr 14 '12
9 Is there a long exact sequence associated to a ramified covering? Mar 6 '11
6 Null-homotopy of diagonal map Feb 22 '11
5 Does the classifying space of monoids commute with wedge sum up to weak equivalence? May 9 '12
3 Is there a counterexample to this stronger version of James homotopy splitting? Dec 17 '11
2 Examples of Simplicial Groupoids in Nature Dec 25 '11
2 Is the nerve of a category a fully faithfully functor up to homotopy? Dec 14 '11
2 Is the homotopy of a primitively generated Hopf algebra still primitively generated? Feb 13 '11
2 Does the following categorial sum preserve weak equivalences? Oct 2 '12
1 Is the nerve of a groupoid an EM space? Dec 7 '11
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