User John Klein

61 votes

2 answers

3k views

Thomason's "open letter" to the mathematical community

asked Oct 1, 2021 at 13:15

28 votes

0 answers

1k views

On the (derived) dual to the James construction.

asked Feb 4, 2011 at 20:42

18 votes

2 answers

2k views

Geometric interpretation of the Pontryagin square

asked Mar 25, 2011 at 18:41

18 votes

1 answer

581 views

Local homology of a space of unitary matrices

asked May 2, 2017 at 22:25

17 votes

3 answers

2k views

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

asked Jan 30, 2011 at 3:15

16 votes

1 answer

568 views

Whitehead products and Framed Manifolds

asked Mar 18, 2016 at 2:20

16 votes

1 answer

2k views

On the wikipedia entry for Borel-Moore homology

asked Jul 29, 2013 at 23:16

16 votes

4 answers

1k views

Multiplicativity of the Euler characteristic for fibrations

asked Feb 24, 2022 at 16:43

15 votes

2 answers

1k views

"Strøm-type" model structure on chain complexes?

asked Jan 19, 2011 at 12:34

13 votes

2 answers

514 views

"Burnside ring" of the natural numbers and algebraic K-theory

asked Apr 7, 2022 at 20:40

12 votes

1 answer

345 views

Rational homotopy invariance of algebraic $K$-theory

asked Jun 28, 2020 at 14:25

12 votes

0 answers

400 views

Hilton-Eckmann dual of the Steenrod Algebra

asked May 15, 2012 at 15:24

12 votes

1 answer

882 views

Equivariant homotopy theory: some history questions

asked Sep 3, 2012 at 23:00

12 votes

1 answer

936 views

On the stable splitting of loops on a suspension

asked Feb 25, 2013 at 21:54

12 votes

1 answer

213 views

A variant of $\ell^2$-cochains

asked Aug 13, 2017 at 16:04

11 votes

2 answers

685 views

Reference request: Goodwillie tower of the identity

asked May 10, 2016 at 13:37

11 votes

1 answer

584 views

co-$A_\infty$ spaces

asked Dec 24, 2010 at 18:06

10 votes

0 answers

356 views

Question about $A_\infty$ maps

asked Jan 12, 2011 at 3:22

10 votes

3 answers

605 views

On the naturality of the bar construction

asked Mar 19, 2013 at 17:57

10 votes

0 answers

527 views

When is the one-point compactification well-pointed?

asked Jul 31, 2013 at 22:28

10 votes

1 answer

621 views

Acyclic aspherical spaces with acyclic fundamental groups

asked Nov 28, 2017 at 18:55

9 votes

0 answers

373 views

History of the definition of smooth manifold with boundary

asked Feb 26, 2019 at 19:14

9 votes

2 answers

672 views

"Skew Cohomology" of a Space

asked Mar 4, 2011 at 0:34

8 votes

1 answer

509 views

Weak Vector Bundles

asked Jan 19, 2012 at 16:48

8 votes

1 answer

1k views

The free smooth path space on a manifold

asked Nov 3, 2019 at 2:08

8 votes

1 answer

373 views

Finite domination and compact ENRs

asked Mar 27, 2022 at 19:10

8 votes

1 answer

831 views

On the Euler characteristic of a Poincaré duality space

asked Jul 27, 2022 at 17:22

8 votes

1 answer

267 views

Finite domination and Poincaré duality spaces

asked Oct 4, 2022 at 12:53

7 votes

0 answers

137 views

Weak homotopy type of the Cech Nerve

asked Mar 14, 2021 at 2:22

7 votes

1 answer

755 views

Filtered homotopy colimits and singular homology

asked Jul 2, 2021 at 15:04

Stack Exchange Network

44 Questions

Thomason's "open letter" to the mathematical community

On the (derived) dual to the James construction.

Geometric interpretation of the Pontryagin square

Local homology of a space of unitary matrices

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

Whitehead products and Framed Manifolds

On the wikipedia entry for Borel-Moore homology

Multiplicativity of the Euler characteristic for fibrations

"Strøm-type" model structure on chain complexes?

"Burnside ring" of the natural numbers and algebraic K-theory

Rational homotopy invariance of algebraic $K$-theory

Hilton-Eckmann dual of the Steenrod Algebra

Equivariant homotopy theory: some history questions

On the stable splitting of loops on a suspension

A variant of $\ell^2$-cochains

Reference request: Goodwillie tower of the identity

co-$A_\infty$ spaces

Question about $A_\infty$ maps

On the naturality of the bar construction

When is the one-point compactification well-pointed?

Acyclic aspherical spaces with acyclic fundamental groups

History of the definition of smooth manifold with boundary

"Skew Cohomology" of a Space

Weak Vector Bundles

The free smooth path space on a manifold

Finite domination and compact ENRs

On the Euler characteristic of a Poincaré duality space

Finite domination and Poincaré duality spaces

Weak homotopy type of the Cech Nerve

Filtered homotopy colimits and singular homology