User Eric Ley

7 votes

1 answer

235 views

Continuous surjection $\mathbb R^m\to \mathbb R^n$ that is not a quotient map

asked Jul 27 at 4:05

4 votes

0 answers

114 views

When is $\text{gr}(V)\cong V$?

asked Mar 6 at 16:16

4 votes

1 answer

111 views

When can a homotopy lift to its compactification?

asked Mar 11 at 0:39

3 votes

1 answer

102 views

Action of symmetry group on homology?

asked Nov 13, 2023 at 6:30

3 votes

1 answer

95 views

Why the bridge index of $8_{10}$ is 3?

asked Nov 26, 2023 at 16:24

3 votes

1 answer

128 views

Generic intersection of hyperplanes

asked Apr 6 at 5:24

2 votes

0 answers

68 views

Finding a generator of $\tilde{H}^n(S^n)$ in Hatcher.

asked Jul 23 at 7:37

2 votes

0 answers

54 views

Why $\pm 1$ surgery on homology sphere again yeilds homology sphere?

asked Mar 10 at 6:49

2 votes

0 answers

138 views

Sylow $p$-Subgroups of $GL_n(\mathbb F_q)$

asked Jan 30 at 2:28

2 votes

1 answer

148 views

Is this quotient space a manifold?

asked Feb 14 at 10:58

2 votes

0 answers

58 views

How to show complete reducibility from this special case?

asked Feb 22 at 7:36

1 vote

1 answer

93 views

How to show this surface is compressible

asked Dec 5, 2023 at 4:30

1 vote

1 answer

79 views

Complete irreducibility of infinitely dimensional representation

asked Dec 17, 2023 at 11:30

1 vote

2 answers

84 views

Motivation for characters in Harris and Fulton

asked Dec 25, 2023 at 3:57

1 vote

1 answer

114 views

The standard representation of symmetry group

asked Dec 28, 2023 at 6:53

1 vote

0 answers

47 views

Definition of proper map and compactification? [duplicate]

asked Nov 13, 2023 at 7:11

1 vote

0 answers

67 views

Is integral extension of rings a local property?

asked Jul 25 at 10:21

1 vote

2 answers

139 views

On Atiyah-Macdonald proposition 3.11(iv)

asked Jul 13 at 4:34

1 vote

0 answers

27 views

Generic Intersection of Submanifolds

asked Apr 7 at 8:09

1 vote

0 answers

74 views

Power series expansions and limits of knot invariants

asked May 16 at 10:41

1 vote

0 answers

64 views

Decomposition of Differential Forms

asked May 28 at 5:11

1 vote

1 answer

89 views

How to compute the homology of this mapping torus

asked Aug 4 at 7:58

1 vote

1 answer

53 views

$S$ splits iff $S\otimes N$ Exact

asked Aug 5 at 4:03

0 votes

0 answers

27 views

Orientation and frame on a smooth curve

asked Aug 7 at 8:44

0 votes

0 answers

38 views

Homotopy lifting property from lifting criterion

asked Aug 30 at 11:03

0 votes

0 answers

19 views

Equivalent definition for bundle orientability.

asked May 28 at 6:01

0 votes

1 answer

37 views

Compute the homology of this configuration space.

asked May 14 at 4:53

0 votes

0 answers

119 views

Smooth v.s. Infinitely differentiable

asked Nov 16, 2023 at 3:41

0 votes

1 answer

50 views

Free chain complex and exactness

asked Nov 22, 2023 at 14:29

0 votes

0 answers

51 views

What are the primitive elements of tensor algebra

asked Mar 2 at 2:34

Stack Exchange Network

33 Questions

Continuous surjection $\mathbb R^m\to \mathbb R^n$ that is not a quotient map

When is $\text{gr}(V)\cong V$?

When can a homotopy lift to its compactification?

Action of symmetry group on homology?

Why the bridge index of $8_{10}$ is 3?

Generic intersection of hyperplanes

Finding a generator of $\tilde{H}^n(S^n)$ in Hatcher.

Why $\pm 1$ surgery on homology sphere again yeilds homology sphere?

Sylow $p$-Subgroups of $GL_n(\mathbb F_q)$

Is this quotient space a manifold?

How to show complete reducibility from this special case?

How to show this surface is compressible

Complete irreducibility of infinitely dimensional representation

Motivation for characters in Harris and Fulton

The standard representation of symmetry group

Definition of proper map and compactification? [duplicate]

Is integral extension of rings a local property?

On Atiyah-Macdonald proposition 3.11(iv)

Generic Intersection of Submanifolds

Power series expansions and limits of knot invariants

Decomposition of Differential Forms

How to compute the homology of this mapping torus

$S$ splits iff $S\otimes N$ Exact

Orientation and frame on a smooth curve

Homotopy lifting property from lifting criterion

Equivalent definition for bundle orientability.

Compute the homology of this configuration space.

Smooth v.s. Infinitely differentiable

Free chain complex and exactness

What are the primitive elements of tensor algebra