User Jeff Strom

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

5 votes

Accepted

homotopical immersion of the wedge product of countable many circles in $R^n$

answered Oct 24, 2010 at 21:06

5 votes

$H_2$ of a simply connected Lie group vanishes

answered May 26, 2011 at 20:04

4 votes

homotopy pushout of spaces homotopic to finite CW complexes

answered Feb 27, 2011 at 11:44

4 votes

Examples where it's useful to know that a mathematical object belongs to some family of objects

answered Dec 15, 2011 at 15:24

4 votes

The Higman group

answered Feb 3, 2012 at 2:15

4 votes

The prime numbers modulo $k$, are not periodic

answered May 28, 2014 at 2:06

4 votes

Accepted

Do Smash Products and Quotients Commute?

answered Oct 24, 2010 at 22:33

4 votes

Ways to prove the fundamental theorem of algebra

answered Oct 17, 2010 at 13:54

4 votes

Spectral sequences: opening the black box slowly with an example

answered Nov 6, 2010 at 12:35

4 votes

Question about the fundamental group and homotopy equivalence

answered Jul 11, 2010 at 14:39

4 votes

L-S category versus Betti numbers

answered Jun 25, 2010 at 4:44

4 votes

Accepted

Extension of refined subspace topology

answered Feb 4, 2020 at 16:21

4 votes

How does one justify funding for mathematics research?

answered Dec 11, 2017 at 1:00

4 votes

Accepted

Homology groups of compact subset of $\mathbb{R}^2$

answered Feb 26, 2017 at 19:04

4 votes

Accepted

A CW is of countable type, iff all its homotopy groups are countable? (References?)

answered Aug 20, 2016 at 15:51

3 votes

Special cases of Dirichlet's theorem

answered Mar 16, 2017 at 0:51

3 votes

Removing simplices from simplicial complexes without decreasing connectedness

answered Feb 16, 2017 at 14:28

3 votes

17 camels trick

answered Nov 13, 2017 at 14:15

3 votes

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

answered Aug 26, 2017 at 17:06

3 votes

a comparison between LS and cohomological dimension

answered Nov 2, 2017 at 8:03

3 votes

Accepted

Is the Hurewicz model category left proper?

answered May 5, 2019 at 1:09

3 votes

Accepted

Rationalization of topological groups and degree maps

answered Feb 2, 2019 at 16:15

3 votes

Accepted

How can I prove that the derived couple of the homotopy exact couple is an invariant?

answered Jul 5, 2010 at 12:46

3 votes

Deeper meanings of barycentric subdivision

answered Jul 8, 2010 at 13:39

3 votes

Strengthening the induction hypothesis

answered Jul 13, 2010 at 14:56

3 votes

What's your favorite equation, formula, identity or inequality?

answered Jul 15, 2010 at 14:01

3 votes

homotopy of sphere maps

answered Dec 31, 2010 at 19:59

3 votes

Writing papers in pre-LaTeX era?

answered Dec 1, 2010 at 3:42

3 votes

Is there a functorial proof that Eilenberg-MacLane spaces are unique up to homotopy equivalence?

answered Dec 10, 2010 at 18:45

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127 Answers

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

homotopical immersion of the wedge product of countable many circles in $R^n$

$H_2$ of a simply connected Lie group vanishes

homotopy pushout of spaces homotopic to finite CW complexes

Examples where it's useful to know that a mathematical object belongs to some family of objects

The Higman group

The prime numbers modulo $k$, are not periodic

Do Smash Products and Quotients Commute?

Ways to prove the fundamental theorem of algebra

Spectral sequences: opening the black box slowly with an example

Question about the fundamental group and homotopy equivalence

L-S category versus Betti numbers

Extension of refined subspace topology

How does one justify funding for mathematics research?

Homology groups of compact subset of $\mathbb{R}^2$

A CW is of countable type, iff all its homotopy groups are countable? (References?)

Special cases of Dirichlet's theorem

Removing simplices from simplicial complexes without decreasing connectedness

17 camels trick

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

a comparison between LS and cohomological dimension

Is the Hurewicz model category left proper?

Rationalization of topological groups and degree maps

How can I prove that the derived couple of the homotopy exact couple is an invariant?

Deeper meanings of barycentric subdivision

Strengthening the induction hypothesis

What's your favorite equation, formula, identity or inequality?

homotopy of sphere maps

Writing papers in pre-LaTeX era?

Is there a functorial proof that Eilenberg-MacLane spaces are unique up to homotopy equivalence?