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Gao 2Man
  • Member for 12 years
  • Last seen more than 4 years ago
  • Singapore
21 votes
4 answers
2k views

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

9 votes
2 answers
793 views

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

6 votes
3 answers
649 views

Null-homotopy of diagonal map

5 votes
3 answers
880 views

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

3 votes
2 answers
287 views

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

2 votes
2 answers
869 views

Examples of Simplicial Groupoids in Nature

2 votes
1 answer
383 views

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

2 votes
0 answers
143 views

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

2 votes
1 answer
141 views

Does the following categorial sum preserve weak equivalences?

1 vote
1 answer
241 views

Is the nerve of a groupoid an EM space?

1 vote
2 answers
655 views

How to Construct the Coproduct of Pointed Categories?

0 votes
1 answer
324 views

Decomposition of simplicial G-set?

-1 votes
1 answer
409 views

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

-1 votes
1 answer
225 views

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