User John Klein

41 votes

0 answers

2k views

Thomason's "open letter" to the mathematical community

asked Oct 1, 2021 at 13:15

27 votes

0 answers

1k views

On the (derived) dual to the James construction.

at.algebraic-topology homotopy-theory

asked Feb 4, 2011 at 20:42

18 votes

2 answers

2k views

Geometric interpretation of the Pontryagin square

at.algebraic-topology smooth-manifolds

asked Mar 25, 2011 at 18:41

18 votes

1 answer

550 views

Local homology of a space of unitary matrices

reference-request at.algebraic-topology differential-topology smooth-manifolds stratifications

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?

at.algebraic-topology homotopy-theory

asked Jan 30, 2011 at 3:15

16 votes

1 answer

534 views

Whitehead products and Framed Manifolds

at.algebraic-topology homotopy-theory smooth-manifolds whitehead-product

asked Mar 18, 2016 at 2:20

16 votes

1 answer

2k views

On the wikipedia entry for Borel-Moore homology

at.algebraic-topology homology

asked Jul 29, 2013 at 23:16

16 votes

4 answers

1k views

Multiplicativity of the Euler characteristic for fibrations

reference-request at.algebraic-topology

asked Feb 24 at 16:43

15 votes

2 answers

1k views

"Strøm-type" model structure on chain complexes?

at.algebraic-topology model-categories

asked Jan 19, 2011 at 12:34

12 votes

0 answers

393 views

Hilton-Eckmann dual of the Steenrod Algebra

at.algebraic-topology homotopy-theory

asked May 15, 2012 at 15:24

12 votes

1 answer

818 views

Equivariant homotopy theory: some history questions

ho.history-overview at.algebraic-topology

asked Sep 3, 2012 at 23:00

12 votes

1 answer

870 views

On the stable splitting of loops on a suspension

at.algebraic-topology homotopy-theory ring-spectra

asked Feb 25, 2013 at 21:54

12 votes

1 answer

206 views

A variant of $\ell^2$-cochains

reference-request at.algebraic-topology fa.functional-analysis gt.geometric-topology

asked Aug 13, 2017 at 16:04

12 votes

1 answer

321 views

Rational homotopy invariance of algebraic $K$-theory

reference-request at.algebraic-topology algebraic-k-theory

asked Jun 28, 2020 at 14:25

12 votes

2 answers

466 views

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

at.algebraic-topology rt.representation-theory algebraic-k-theory

asked Apr 7 at 20:40

11 votes

2 answers

656 views

Reference request: Goodwillie tower of the identity

at.algebraic-topology homotopy-theory

asked May 10, 2016 at 13:37

10 votes

0 answers

502 views

When is the one-point compactification well-pointed?

at.algebraic-topology gn.general-topology homotopy-theory compactifications

asked Jul 31, 2013 at 22:28

10 votes

1 answer

556 views

Acyclic aspherical spaces with acyclic fundamental groups

at.algebraic-topology group-cohomology localization

asked Nov 28, 2017 at 18:55

10 votes

3 answers

582 views

On the naturality of the bar construction

at.algebraic-topology loop-spaces

asked Mar 19, 2013 at 17:57

10 votes

1 answer

576 views

co-$A_\infty$ spaces

at.algebraic-topology higher-category-theory

asked Dec 24, 2010 at 18:06

10 votes

0 answers

352 views

Question about $A_\infty$ maps

at.algebraic-topology homotopy-theory operads

asked Jan 12, 2011 at 3:22

9 votes

2 answers

645 views

"Skew Cohomology" of a Space

at.algebraic-topology cohomology

asked Mar 4, 2011 at 0:34

9 votes

0 answers

332 views

History of the definition of smooth manifold with boundary

dg.differential-geometry differential-topology ho.history-overview smooth-manifolds manifolds

asked Feb 26, 2019 at 19:14

8 votes

1 answer

506 views

Weak Vector Bundles

at.algebraic-topology vector-bundles

asked Jan 19, 2012 at 16:48

8 votes

1 answer

952 views

The free smooth path space on a manifold

differential-topology smooth-manifolds fibre-bundles loop-spaces

asked Nov 3, 2019 at 2:08

8 votes

1 answer

675 views

On the Euler characteristic of a Poincaré duality space

at.algebraic-topology smooth-manifolds manifolds duality

asked Jul 27 at 17:22

8 votes

1 answer

268 views

Finite domination and compact ENRs

at.algebraic-topology gn.general-topology homotopy-theory obstruction-theory

asked Mar 27 at 19:10

7 votes

0 answers

125 views

Weak homotopy type of the Cech Nerve

reference-request at.algebraic-topology

asked Mar 14, 2021 at 2:22

7 votes

2 answers

991 views

Deformation theory of co-$A_\infty$ structures.

at.algebraic-topology homotopy-theory homology deformation-theory

asked Dec 27, 2010 at 17:35

7 votes

2 answers

539 views

Why does the map $BG\to A(*)$ fail to split?

at.algebraic-topology algebraic-k-theory

asked Jan 23, 2011 at 4:55

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41 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?

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

Rational homotopy invariance of algebraic $K$-theory

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

Reference request: Goodwillie tower of the identity

When is the one-point compactification well-pointed?

Acyclic aspherical spaces with acyclic fundamental groups

On the naturality of the bar construction

co-$A_\infty$ spaces

Question about $A_\infty$ maps

"Skew Cohomology" of a Space

History of the definition of smooth manifold with boundary

Weak Vector Bundles

The free smooth path space on a manifold

On the Euler characteristic of a Poincaré duality space

Finite domination and compact ENRs

Weak homotopy type of the Cech Nerve

Deformation theory of co-$A_\infty$ structures.

Why does the map $BG\to A(*)$ fail to split?