User Jeff Strom

10 votes

Accepted

Decomposing the plane into intervals

answered Oct 26, 2010 at 19:41

9 votes

when cup product is a zero homomorphism

answered Aug 4, 2010 at 21:49

9 votes

Accepted

continuous images of open intervals

answered May 25, 2014 at 1:11

9 votes

Homotopic maps out of cofibration sequences

answered Nov 10, 2011 at 1:27

8 votes

What does the adjective "natural" actually mean?

answered Mar 1, 2011 at 1:02

8 votes

Computing homotopies

answered Jan 4, 2011 at 17:07

8 votes

Counterexamples for strengthening Whitehead's theorem?

answered Jul 6, 2015 at 3:22

8 votes

Examples of famous 'workhorse' theorems

answered Jul 25, 2014 at 1:24

8 votes

Theorems that led to very successful research programs in Geometry and Topology

answered Jan 5, 2017 at 13:52

7 votes

Kunneth Theorem and localisation

answered May 5, 2017 at 14:37

7 votes

Spaces that are both homotopically and cohomologically finite

answered Jul 31, 2016 at 12:15

7 votes

Accepted

Is being an NDR a local property?

answered Sep 17, 2016 at 20:23

7 votes

The impact of large cardinals in mathematics

answered Sep 29, 2014 at 6:52

7 votes

Fiber homotopy equivalence

answered Feb 20, 2018 at 19:23

7 votes

The fundamental group of space which has both an H and a co-H structure

answered Feb 26, 2011 at 21:22

7 votes

Transversality in the proof of the Blakers-Massey Theorem. Is it necessary?

answered Feb 3, 2011 at 4:51

7 votes

Surprising and Useful Physical Intuition for Mathematical Objects

answered Mar 30, 2011 at 0:21

6 votes

Techniques for computing cup products in singular cohomology

answered May 11, 2011 at 13:10

6 votes

Is there the Whitehead theorem for cohomology theory?

answered Mar 8, 2011 at 10:58

6 votes

Should a theorem be numbered by where it is first stated or where it is proven?

answered May 20, 2014 at 18:31

6 votes

If $E$ maps onto a contractible space with contractible fibers, must $E$ be contractible?

answered Jun 20, 2014 at 13:49

6 votes

about relative homotopy group

answered Aug 26, 2012 at 15:46

6 votes

Is there a reasonable way to refer to a 23 page article with 28 authors?

answered Sep 22, 2010 at 19:53

6 votes

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

answered Apr 19, 2021 at 12:33

6 votes

Vietoris-Begle theorem for simplicial sets

answered Oct 23, 2015 at 10:54

5 votes

Accepted

Hausdorff spaces such that every subset is a retract

answered Dec 9, 2014 at 15:26

5 votes

Whitehead for maps

answered Dec 10, 2014 at 18:25

5 votes

Two H-space structures on S^3 and [X,S^3] different as groups for each: Explicit Example?

answered Mar 17, 2015 at 13:36

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

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

Stack Exchange Network

127 Answers

Decomposing the plane into intervals

when cup product is a zero homomorphism

continuous images of open intervals

Homotopic maps out of cofibration sequences

What does the adjective "natural" actually mean?

Computing homotopies

Counterexamples for strengthening Whitehead's theorem?

Examples of famous 'workhorse' theorems

Theorems that led to very successful research programs in Geometry and Topology

Kunneth Theorem and localisation

Spaces that are both homotopically and cohomologically finite

Is being an NDR a local property?

The impact of large cardinals in mathematics

Fiber homotopy equivalence

The fundamental group of space which has both an H and a co-H structure

Transversality in the proof of the Blakers-Massey Theorem. Is it necessary?

Surprising and Useful Physical Intuition for Mathematical Objects

Techniques for computing cup products in singular cohomology

Is there the Whitehead theorem for cohomology theory?

Should a theorem be numbered by where it is first stated or where it is proven?

If $E$ maps onto a contractible space with contractible fibers, must $E$ be contractible?

about relative homotopy group

Is there a reasonable way to refer to a 23 page article with 28 authors?

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

Vietoris-Begle theorem for simplicial sets

Hausdorff spaces such that every subset is a retract

Whitehead for maps

Two H-space structures on S^3 and [X,S^3] different as groups for each: Explicit Example?

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

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