User Ricardo Andrade

40 votes

Converse of Poincaré-Hopf theorem

answered Jul 21, 2013 at 8:23

24 votes

How many distinct homeomorphism classes of lens spaces are there with a fixed p?

answered Feb 6, 2014 at 21:14

23 votes

Accepted

Is the counit of geometric realization a Serre fibration?

answered Jun 25, 2013 at 20:23

21 votes

Accepted

Example of fiber bundle that is not a fibration

answered Apr 2, 2013 at 3:06

19 votes

Accepted

Are maximal compact subgroups of connected groups connected?

answered Aug 28, 2013 at 8:27

18 votes

Accepted

Cancellation law for $M^n\times \mathbb R= N^n\times \mathbb R$.

answered Mar 30, 2013 at 0:58

17 votes

Accepted

Manifolds with homeomorphic interiors

answered Mar 30, 2013 at 20:58

15 votes

Accepted

Three questions on $\operatorname{hocolim}$

answered Jun 28, 2013 at 10:08

15 votes

Accepted

homotopy type of embeddings versus diffeomorphisms

answered Jan 29, 2013 at 8:44

15 votes

What manifolds are boundaries of euclidian spaces ?

answered Feb 21, 2013 at 21:19

13 votes

Accepted

Does the bordism homology theory satisfy the weak equivalence axiom?

answered Mar 7, 2012 at 11:36

12 votes

Can the n-string sphere braid group embed in to the (n+1)-string sphere braid group?

answered Jan 21, 2013 at 23:48

12 votes

Plus construction considerations.

answered Feb 10, 2013 at 0:14

12 votes

Counterexamples in algebraic topology?

answered Mar 29, 2013 at 1:56

11 votes

Accepted

Is there a general theory of fiber theorems?

answered Mar 19, 2013 at 12:51

11 votes

Accepted

What fraction of n-point sets in the unit ball have diameter smaller than 1?

answered Jun 15, 2013 at 10:50

11 votes

Accepted

Monoidal model category structure on a functor category.

answered Feb 1, 2013 at 4:12

11 votes

Distinct manifolds with the same configuration spaces?

answered Nov 23, 2013 at 0:55

10 votes

Accepted

Reference Request: Compact manifolds with boundary have the homotopy type of a CW-complex

answered Jan 31, 2014 at 10:37

9 votes

Accepted

C^2 submanifolds contained in a hypersurface

answered Dec 6, 2013 at 15:50

9 votes

Accepted

When do functors induce monadic adjunctions to presheaf categories

answered Feb 3, 2012 at 1:13

9 votes

Accepted

When do reflexive coequalizers preserve weak equivalences?

answered Mar 3, 2013 at 9:37

9 votes

Accepted

Does there exist a space X whose suspension is homotopy equivalent to [0,1] rel ends but where X is not contractible?

answered May 16, 2013 at 8:01

8 votes

Serre Spectral Sequence of Representations

answered Mar 10, 2013 at 10:44

7 votes

Explicit constructions of K(G,2)?

answered Jun 21, 2012 at 5:55

7 votes

Accepted

Local finality condition (for re-indexing parameterized colimits)

answered Feb 6, 2013 at 12:56

7 votes

Accepted

Does the signature admit a homotopy coherent refinement?

answered Nov 9, 2013 at 18:56

6 votes

Accepted

Quotients of classifying spaces

answered Apr 27, 2013 at 8:29

6 votes

Is the space of diffeomorphisms homotopy equivalent to a CW-complex?

answered Apr 8, 2013 at 23:16

5 votes

Does Euclidean space have a compact factor?

answered Apr 4, 2013 at 10:04

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42 Answers

Converse of Poincaré-Hopf theorem

How many distinct homeomorphism classes of lens spaces are there with a fixed p?

Is the counit of geometric realization a Serre fibration?

Example of fiber bundle that is not a fibration

Are maximal compact subgroups of connected groups connected?

Cancellation law for $M^n\times \mathbb R= N^n\times \mathbb R$.

Manifolds with homeomorphic interiors

Three questions on $\operatorname{hocolim}$

homotopy type of embeddings versus diffeomorphisms

What manifolds are boundaries of euclidian spaces ?

Does the bordism homology theory satisfy the weak equivalence axiom?

Can the n-string sphere braid group embed in to the (n+1)-string sphere braid group?

Plus construction considerations.

Counterexamples in algebraic topology?

Is there a general theory of fiber theorems?

What fraction of n-point sets in the unit ball have diameter smaller than 1?

Monoidal model category structure on a functor category.

Distinct manifolds with the same configuration spaces?

Reference Request: Compact manifolds with boundary have the homotopy type of a CW-complex

C^2 submanifolds contained in a hypersurface

When do functors induce monadic adjunctions to presheaf categories

When do reflexive coequalizers preserve weak equivalences?

Does there exist a space X whose suspension is homotopy equivalent to [0,1] rel ends but where X is not contractible?

Serre Spectral Sequence of Representations

Explicit constructions of K(G,2)?

Local finality condition (for re-indexing parameterized colimits)

Does the signature admit a homotopy coherent refinement?

Quotients of classifying spaces

Is the space of diffeomorphisms homotopy equivalent to a CW-complex?

Does Euclidean space have a compact factor?