User Gao 2Man - MathOverflow

Gao 2Man

Member for 13 years, 6 months
Last seen more than 5 years ago

Singapore

14 Questions

Score Activity Newest Views

21 votes

4 answers

2k views

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

asked Apr 14, 2012 at 6:19

9 votes

2 answers

875 views

Is there a long exact sequence associated to a ramified covering?

asked Mar 6, 2011 at 5:32

6 votes

3 answers

743 views

Null-homotopy of diagonal map

asked Feb 22, 2011 at 6:48

5 votes

3 answers

972 views

Does the classifying space of monoids commute with wedge sum up to weak equivalence?

asked May 9, 2012 at 14:09

3 votes

2 answers

296 views

Is there a counterexample to this stronger version of James homotopy splitting?

asked Dec 17, 2011 at 12:59

2 votes

2 answers

936 views

Examples of Simplicial Groupoids in Nature

asked Dec 25, 2011 at 5:40

2 votes

1 answer

396 views

Is the nerve of a category a fully faithfully functor up to homotopy?

asked Dec 14, 2011 at 6:11

2 votes

0 answers

146 views

Is the homotopy of a primitively generated Hopf algebra still primitively generated?

asked Feb 13, 2011 at 7:15

2 votes

1 answer

143 views

Does the following categorial sum preserve weak equivalences?

asked Oct 2, 2012 at 6:40

1 vote

1 answer

245 views

Is the nerve of a groupoid an EM space?

asked Dec 7, 2011 at 10:55

1 vote

2 answers

716 views

How to Construct the Coproduct of Pointed Categories?

asked Apr 8, 2012 at 7:51

0 votes

1 answer

348 views

Decomposition of simplicial G-set?

asked Dec 10, 2011 at 5:28

0 votes

1 answer

237 views

When does nerving the groupoid completion of a category give a weak equivalence?

asked Apr 21, 2012 at 4:31

-1 votes

1 answer

415 views

How does the discrete group act on simplicial set level by level

asked Nov 8, 2010 at 4:46