User B.Hueber

8 votes

2 answers

501 views

Why is the tangent bundle defined using a disjoint union?

asked Mar 20, 2020 at 14:21

7 votes

1 answer

295 views

Boundary of manifold with boundary has empty boundary: What about corners in the topological category?

asked Jan 18, 2022 at 12:49

7 votes

3 answers

300 views

Double covariant derivative in coordinates: Why does this work?

asked Jan 29 at 15:02

6 votes

1 answer

503 views

On simplicial complexes and their geometric realization

asked Mar 1, 2022 at 14:28

6 votes

0 answers

270 views

Proof of formula involving the Haar measure of SU(2).

asked Dec 10, 2021 at 17:10

5 votes

1 answer

287 views

Why is there no "weakly version" of locally path-connectedness?

asked Apr 13, 2020 at 19:33

5 votes

1 answer

168 views

Equivalence of triangulations and piecewise-linear triangulations in dimension $d\leq 4$

asked Jan 8, 2022 at 22:51

4 votes

1 answer

78 views

Can every manifold with torus boundary be cut?

asked Sep 22, 2022 at 14:48

4 votes

1 answer

83 views

Precise assumption in spectral theorem of unbounded operators

asked Oct 9, 2022 at 21:08

4 votes

1 answer

232 views

Is it always possible to find a partition of unity subordinate to a cover with the same index set?

asked Mar 31, 2020 at 12:11

4 votes

1 answer

157 views

Formal definition of a Pseudotensor

asked Aug 21, 2019 at 19:30

3 votes

1 answer

1k views

Transformation law Christoffel symbols

asked Nov 2, 2019 at 10:51

3 votes

2 answers

651 views

Prove that $\psi_[X,Y]=[\psi_ X,\psi_* Y]$, for vector fields $X,Y$ and $\psi$ diffeomorphism in $\mathbb R^n$

asked Nov 8, 2019 at 17:01

3 votes

1 answer

788 views

Lie derivative of vector fields and flows of vector fields: Is this formula right?

asked Jan 20, 2020 at 20:26

3 votes

0 answers

139 views

Integrating $\delta(g^{2})$ over $\mathrm{SU}(2)$

asked Dec 11, 2021 at 19:56

3 votes

1 answer

178 views

Decomposition of the Delta Function on a Lie group in terms of irreps

asked May 18, 2021 at 12:58

3 votes

0 answers

69 views

Tensor product of fundamental representation of $\mathrm{SU}(2)$ as submodule and decomposition of elements

asked Nov 29, 2021 at 14:07

3 votes

1 answer

108 views

Every Lie group homomorphism from $U(1)$ to $\mathbb{R}$ is trivial

asked Jul 17, 2021 at 10:28

3 votes

0 answers

43 views

Counting number of vertices in a simplicial complex

asked Aug 3, 2021 at 16:13

3 votes

2 answers

226 views

Levi-Civita connection acting on tensor density

asked Nov 17, 2022 at 9:50

3 votes

0 answers

68 views

Gauss Equation in Coordinates

asked Dec 15, 2022 at 14:51

3 votes

1 answer

109 views

Connected sum of one manifold WITH boundary with a manifold WITHOUT boundary

asked Dec 4, 2021 at 14:47

3 votes

1 answer

92 views

Cut out Balls from manifolds.

asked Jan 23, 2022 at 15:49

3 votes

0 answers

52 views

Decomposition of tensor field on hypersurface

asked Jan 18 at 15:07

3 votes

1 answer

69 views

Restricted Cotangent Bundle

asked May 23 at 7:33

3 votes

2 answers

63 views

Coclosed form is sum of coexact and harmonic form.

asked May 24 at 17:23

3 votes

1 answer

146 views

Existence and uniqueness of formal adjoint operator on manifolds

asked Mar 1 at 19:24

3 votes

1 answer

75 views

Connection laplacian and abstract index notation

asked Aug 1 at 8:43

2 votes

1 answer

102 views

Non-compact manifolds with finite volume and conformal transformation

asked Jul 25 at 8:00

2 votes

1 answer

56 views

Lie derivative and injectivity

asked Jul 26 at 15:14

Stack Exchange Network

101 Questions

Why is the tangent bundle defined using a disjoint union?

Boundary of manifold with boundary has empty boundary: What about corners in the topological category?

Double covariant derivative in coordinates: Why does this work?

On simplicial complexes and their geometric realization

Proof of formula involving the Haar measure of SU(2).

Why is there no "weakly version" of locally path-connectedness?

Equivalence of triangulations and piecewise-linear triangulations in dimension $d\leq 4$

Can every manifold with torus boundary be cut?

Precise assumption in spectral theorem of unbounded operators

Is it always possible to find a partition of unity subordinate to a cover with the same index set?

Formal definition of a Pseudotensor

Transformation law Christoffel symbols

Prove that $\psi_[X,Y]=[\psi_ X,\psi_* Y]$, for vector fields $X,Y$ and $\psi$ diffeomorphism in $\mathbb R^n$

Lie derivative of vector fields and flows of vector fields: Is this formula right?

Integrating $\delta(g^{2})$ over $\mathrm{SU}(2)$

Decomposition of the Delta Function on a Lie group in terms of irreps

Tensor product of fundamental representation of $\mathrm{SU}(2)$ as submodule and decomposition of elements

Every Lie group homomorphism from $U(1)$ to $\mathbb{R}$ is trivial

Counting number of vertices in a simplicial complex

Levi-Civita connection acting on tensor density

Gauss Equation in Coordinates

Connected sum of one manifold WITH boundary with a manifold WITHOUT boundary

Cut out Balls from manifolds.

Decomposition of tensor field on hypersurface

Restricted Cotangent Bundle

Coclosed form is sum of coexact and harmonic form.

Existence and uniqueness of formal adjoint operator on manifolds

Connection laplacian and abstract index notation

Non-compact manifolds with finite volume and conformal transformation

Lie derivative and injectivity