User Xiaolei Wu

21 votes

4 answers

4k views

Is every locally connected subset of Euclidean space R^n locally path connected ?

asked Nov 20, 2010 at 16:28

16 votes

2 answers

2k views

Smooth structures on the connected sum of a manifold with an Exotic sphere

asked Dec 8, 2010 at 23:45

16 votes

2 answers

2k views

Can anyone explain to me what is an assembly map?

asked Mar 2, 2012 at 4:20

16 votes

1 answer

5k views

Is it true that all real projective space $RP^n$ can not be smoothly embedded in $R^{n+1}$ for n >1

asked May 10, 2012 at 15:53

13 votes

2 answers

1k views

Kernel of linear representation of Baumslag-Solitar group

asked Nov 13, 2012 at 21:39

10 votes

1 answer

1k views

CAT(0) groups that does not act on CAT(0) cubical complex

asked Sep 26, 2014 at 12:28

9 votes

0 answers

487 views

When does a CAT(0) group contain a rank one isometry

asked May 2, 2016 at 12:51

9 votes

4 answers

2k views

How to prove the connected sum of two closed aspherical n-manfolds (n >2) is not asperical?

asked Nov 21, 2010 at 22:35

8 votes

2 answers

666 views

whitehead group of product of groups

asked Mar 20, 2012 at 21:32

5 votes

0 answers

285 views

Any method to detect subgroup generated by a subset of the generators from its presentation

asked May 21, 2012 at 5:44

4 votes

2 answers

472 views

Does a homeomorphism of $S^1 \times S^2$ which is homotopy to the identity has to isotope to it?

asked Aug 1, 2011 at 4:27

4 votes

2 answers

2k views

Prime ideals in the ring of algebraic integers

asked Jul 27, 2013 at 19:44

3 votes

0 answers

104 views

Geometric automorphism of free group respect to nonorientable suface

asked Jan 28, 2015 at 13:14

0 votes

1 answer

404 views

Can the order of a rational number in Z/pZ be as large as we want

asked Oct 3, 2012 at 2:40

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14 Questions

Is every locally connected subset of Euclidean space R^n locally path connected ?

Smooth structures on the connected sum of a manifold with an Exotic sphere

Can anyone explain to me what is an assembly map?

Is it true that all real projective space $RP^n$ can not be smoothly embedded in $R^{n+1}$ for n >1

Kernel of linear representation of Baumslag-Solitar group

CAT(0) groups that does not act on CAT(0) cubical complex

When does a CAT(0) group contain a rank one isometry

How to prove the connected sum of two closed aspherical n-manfolds (n >2) is not asperical?

whitehead group of product of groups

Any method to detect subgroup generated by a subset of the generators from its presentation

Does a homeomorphism of $S^1 \times S^2$ which is homotopy to the identity has to isotope to it?

Prime ideals in the ring of algebraic integers

Geometric automorphism of free group respect to nonorientable suface

Can the order of a rational number in Z/pZ be as large as we want