User John Klein

0 votes

First usage of the terms pseudo-isotopy and concordance in manifold theory

answered Oct 4, 2023 at 21:56

3 votes

Accepted

Explaining some detail in Wall's paper of CW-complexes

answered May 12, 2023 at 10:47

3 votes

Accepted

Homotopy between sections

answered Apr 19, 2023 at 10:44

6 votes

Accepted

Is $\Sigma^\infty_+ O(n)^\vee$, the Spanier-Whitehead dual of the orthogonal group, an $A_\infty$-ring spectrum?

answered Dec 4, 2022 at 2:00

2 votes

Multiplicativity of the Euler characteristic for fibrations

answered Feb 27, 2022 at 18:23

7 votes

Multiplicativity of the Euler characteristic for fibrations

answered Feb 27, 2022 at 1:08

12 votes

Accepted

Uses of Volodin's construction of algebraic K-theory

answered Aug 30, 2021 at 23:32

8 votes

How can I construct a closed manifold from a finite CW complex?

answered Aug 8, 2021 at 16:45

2 votes

Accepted

Retractions, homology and multiplication

answered Jul 27, 2021 at 20:51

9 votes

Accepted

Atiyah duality without reference to an embedding

answered Jul 23, 2021 at 18:29

7 votes

Atiyah duality without reference to an embedding

answered Jul 23, 2021 at 13:02

10 votes

Accepted

Whitehead product and a homotopy group of a wedge sum

answered Apr 27, 2021 at 2:38

1 vote

$G$-equivariant intersection theory using differential topology?

answered Dec 24, 2020 at 1:32

7 votes

Why does this construction give a (homotopy-invariant) suspension (resp. homotopy cofiber) in an arbitrary pointed model category?

answered Jun 16, 2020 at 4:01

3 votes

Accepted

A generalization of integral Poincaré duality

answered Jun 1, 2020 at 2:30

1 vote

Spherical objects and K-theory

answered Apr 3, 2020 at 21:33

3 votes

Is it true, the space of embeddings segments is homotopy equivalent to the subspace of all line segments?

answered Feb 2, 2020 at 4:28

10 votes

When is a homotopy pushout contractible?

answered Jan 22, 2020 at 19:53

5 votes

Accepted

pullback and fiber sequence

answered Jan 21, 2020 at 17:13

2 votes

K-theory of free $G$-sets and the classifying space, and generalization

answered Jan 17, 2020 at 2:10

3 votes

Accepted

CW complexes obtained by attaching cells not with increasing dimension

answered Jan 16, 2020 at 12:00

4 votes

moving from sphere spectrum to finite spectrum

answered Jan 15, 2020 at 21:36

1 vote

Existence of homotopy limits and colimits in model categories

answered Dec 13, 2019 at 12:42

10 votes

Accepted

Contraction of a family of loops simultaneously

answered Dec 8, 2019 at 16:33

10 votes

Why is $\mathbb{S}^1$ a cogroup object in $\mathbf{Top.}$?

answered Dec 4, 2019 at 21:35

14 votes

Unstable manifolds of a Morse function give a CW complex

answered Nov 24, 2019 at 16:41

5 votes

Does anyone know a basepoint-free construction of universal covers?

answered Nov 13, 2019 at 12:54

3 votes

Line bundles trivial outside of codimension 3

answered Jul 19, 2019 at 19:23

17 votes

Accepted

Immersions of surfaces in $\mathbb{R}^3$

answered Jul 9, 2019 at 0:30

3 votes

Accepted

Wall self-intersection invariant for odd-dimensional manifolds?

answered Jun 19, 2019 at 14:17

Stack Exchange Network

174 Answers

First usage of the terms pseudo-isotopy and concordance in manifold theory

Explaining some detail in Wall's paper of CW-complexes

Homotopy between sections

Is $\Sigma^\infty_+ O(n)^\vee$, the Spanier-Whitehead dual of the orthogonal group, an $A_\infty$-ring spectrum?

Multiplicativity of the Euler characteristic for fibrations

Multiplicativity of the Euler characteristic for fibrations

Uses of Volodin's construction of algebraic K-theory

How can I construct a closed manifold from a finite CW complex?

Retractions, homology and multiplication

Atiyah duality without reference to an embedding

Atiyah duality without reference to an embedding

Whitehead product and a homotopy group of a wedge sum

$G$-equivariant intersection theory using differential topology?

Why does this construction give a (homotopy-invariant) suspension (resp. homotopy cofiber) in an arbitrary pointed model category?

A generalization of integral Poincaré duality

Spherical objects and K-theory

Is it true, the space of embeddings segments is homotopy equivalent to the subspace of all line segments?

When is a homotopy pushout contractible?

pullback and fiber sequence

K-theory of free $G$-sets and the classifying space, and generalization

CW complexes obtained by attaching cells not with increasing dimension

moving from sphere spectrum to finite spectrum

Existence of homotopy limits and colimits in model categories

Contraction of a family of loops simultaneously

Why is $\mathbb{S}^1$ a cogroup object in $\mathbf{Top.}$?

Unstable manifolds of a Morse function give a CW complex

Does anyone know a basepoint-free construction of universal covers?

Line bundles trivial outside of codimension 3

Immersions of surfaces in $\mathbb{R}^3$

Wall self-intersection invariant for odd-dimensional manifolds?