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

22 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

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

14 votes

Accepted

Three questions on $\operatorname{hocolim}$

answered Jun 28, 2013 at 10:08

12 votes

Counterexamples in algebraic topology?

answered Mar 29, 2013 at 1:56

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

Accepted

Does the bordism homology theory satisfy the weak equivalence axiom?

answered Mar 7, 2012 at 11:36

11 votes

Accepted

Monoidal model category structure on a functor category.

answered Feb 1, 2013 at 4:12

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

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

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

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

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

homotopy type of embeddings versus diffeomorphisms

What manifolds are boundaries of euclidian spaces ?

Three questions on $\operatorname{hocolim}$

Counterexamples in algebraic topology?

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

Plus construction considerations.

Does the bordism homology theory satisfy the weak equivalence axiom?

Monoidal model category structure on a functor category.

Is there a general theory of fiber theorems?

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

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

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

When do functors induce monadic adjunctions to presheaf categories

When do reflexive coequalizers preserve weak equivalences?

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?