User Jeff Strom

31 votes

Accepted

Suspension of a topological space

answered Jun 3, 2021 at 0:57

6 votes

How many n-dimensional closed submanifolds of $R^n$ have Euler characteristic 1?

answered Apr 19, 2021 at 12:33

-1 votes

Is Higman's group a free product?

answered Jan 15, 2021 at 16:37

24 votes

Accepted

Homotopy equivalent Postnikov sections but not homotopy equivalent

answered Jul 30, 2020 at 17:14

11 votes

Why do bees create hexagonal cells ? (Mathematical reasons)

answered Jun 6, 2020 at 18:37

4 votes

Accepted

Extension of refined subspace topology

answered Feb 4, 2020 at 16:21

5 votes

What are your favorite concrete examples of limits or colimits that you would compute during lunch?

answered Nov 30, 2019 at 2:06

20 votes

Accepted

Divisibility in the homotopy groups of spheres?

answered Nov 25, 2019 at 3:52

5 votes

What is the smallest class of spaces closed under finite homotopy colimits, finite homotopy limits, and splitting of homotopy-coherent idempotents?

answered Oct 9, 2019 at 9:14

25 votes

Accepted

Image of a map on cohomology rings

answered Sep 25, 2019 at 0:01

2 votes

Accepted

The model category structure on $\mathbf{TMon}$

answered Sep 24, 2019 at 13:35

40 votes

In a topological space if there exists a loop that cannot be contracted to a point does there exist a simple loop that cannot be contracted also?

answered Aug 9, 2019 at 1:23

3 votes

Accepted

Is the Hurewicz model category left proper?

answered May 5, 2019 at 1:09

2 votes

Injectivity implies surjectivity

answered Mar 31, 2019 at 18:32

40 votes

What are some noteworthy "mic-drop" moments in math?

answered Mar 11, 2019 at 0:22

3 votes

Accepted

Rationalization of topological groups and degree maps

answered Feb 2, 2019 at 16:15

7 votes

Fiber homotopy equivalence

answered Feb 20, 2018 at 19:23

31 votes

Main statement as theorem or corollary

answered Jan 15, 2018 at 14:09

3 votes

How does one justify funding for mathematics research?

answered Dec 11, 2017 at 1:00

3 votes

17 camels trick

answered Nov 13, 2017 at 14:15

2 votes

Topological Complexity $TC$ of two robots moving on number $8$

answered Nov 11, 2017 at 21:45

5 votes

Non-homogeneous space $X$ such that $X\cong X\setminus \{x\}$ for all $x\in X$

answered Nov 9, 2017 at 11:52

14 votes

Teaching Steenrod Operations

answered Nov 2, 2017 at 18:18

3 votes

a comparison between LS and cohomological dimension

answered Nov 2, 2017 at 8:03

17 votes

An abstract nonsense proof of the Hurewicz theorem

answered Oct 11, 2017 at 2:47

3 votes

What is the most useful non-existing object of your field?

answered Aug 26, 2017 at 17:06

7 votes

Kunneth Theorem and localisation

answered May 5, 2017 at 14:37

1 vote

Combinatorial distance between simplicial complexes

answered May 2, 2017 at 11:40

2 votes

The Hopf invariant is an isomorphism for $\pi_3 (S^2)$

answered Apr 25, 2017 at 5:19

3 votes

Special cases of Dirichlet's theorem

answered Mar 16, 2017 at 0:51

Stack Exchange Network

127 Answers

Suspension of a topological space

How many n-dimensional closed submanifolds of $R^n$ have Euler characteristic 1?

Is Higman's group a free product?

Homotopy equivalent Postnikov sections but not homotopy equivalent

Why do bees create hexagonal cells ? (Mathematical reasons)

Extension of refined subspace topology

What are your favorite concrete examples of limits or colimits that you would compute during lunch?

Divisibility in the homotopy groups of spheres?

What is the smallest class of spaces closed under finite homotopy colimits, finite homotopy limits, and splitting of homotopy-coherent idempotents?

Image of a map on cohomology rings

The model category structure on $\mathbf{TMon}$

In a topological space if there exists a loop that cannot be contracted to a point does there exist a simple loop that cannot be contracted also?

Is the Hurewicz model category left proper?

Injectivity implies surjectivity

What are some noteworthy "mic-drop" moments in math?

Rationalization of topological groups and degree maps

Fiber homotopy equivalence

Main statement as theorem or corollary

How does one justify funding for mathematics research?

17 camels trick

Topological Complexity $TC$ of two robots moving on number $8$

Non-homogeneous space $X$ such that $X\cong X\setminus \{x\}$ for all $x\in X$

Teaching Steenrod Operations

a comparison between LS and cohomological dimension

An abstract nonsense proof of the Hurewicz theorem

What is the most useful non-existing object of your field?

Kunneth Theorem and localisation

Combinatorial distance between simplicial complexes

The Hopf invariant is an isomorphism for $\pi_3 (S^2)$

Special cases of Dirichlet's theorem