User StarBucK

11 votes

2 answers

603 views

Fock space used in Quantum mechanic : how can we have direct sum of spaces of different dimensions?

linear-algebra hilbert-spaces

asked Apr 14, 2017 at 17:56

8 votes

3 answers

2k views

Push forward or differential : is there a link with the differential of a function?

differential-geometry

asked Aug 29, 2017 at 23:35

5 votes

3 answers

1k views

"Smooth" tensor field

differential-geometry

asked Apr 5, 2017 at 10:21

5 votes

3 answers

504 views

A nice book on representation of groups (not too theoretical, for physisicts purposes)

group-theory reference-request representation-theory book-recommendation

asked Apr 6, 2017 at 8:53

5 votes

2 answers

2k views

Let $G$ be a Lie group. How to prove that $G/H$ is a manifold?

group-theory differential-geometry lie-groups

asked Apr 6, 2017 at 17:46

4 votes

1 answer

363 views

Irreducible representations of $su2$ in dimension $d$ : how do we know it exists?

representation-theory lie-algebras

asked May 16, 2017 at 23:17

4 votes

0 answers

454 views

Peter Weyl theorem in $SU(2)$ : basis of $L_2[SU(2)]$

linear-algebra group-theory representation-theory

asked Jul 21, 2017 at 13:16

4 votes

1 answer

5k views

Eigenvalues of tensor product of matrices : question about general properties

linear-algebra hilbert-spaces tensor-products

asked Jul 31, 2019 at 17:21

3 votes

2 answers

2k views

Why is the infinite period Fourier series the Fourier transform?

limits fourier-series riemann-integration

asked Sep 30, 2019 at 10:07

3 votes

1 answer

341 views

Question about the physical intuition behind tensors

differential-geometry general-relativity

asked Aug 18, 2017 at 14:38

3 votes

2 answers

302 views

Pull-back of a differential : I get confused with the variables

differential-geometry

asked Aug 19, 2017 at 15:26

3 votes

1 answer

374 views

Misunderstanding on maximal atlas

differential-geometry definition

asked Aug 20, 2017 at 23:59

3 votes

1 answer

663 views

How to go from Lie Algebra representation to group representation?

group-theory representation-theory lie-groups

asked May 10, 2017 at 9:59

3 votes

1 answer

956 views

Maximum number of irreducible representation of finite group

group-theory representation-theory

asked May 28, 2017 at 22:37

3 votes

1 answer

297 views

Difference of vectors living in different tangent spaces

differential-geometry

asked Apr 5, 2017 at 20:39

3 votes

2 answers

130 views

Surface of revolution between two circles

integration surface-integrals

asked Jan 16, 2017 at 23:48

2 votes

1 answer

196 views

Good and bad tensors (and the metric)

differential-geometry

asked Mar 21, 2017 at 20:14

2 votes

1 answer

62 views

Let $f : M \rightarrow N$ where $M$ and $N$ are manifolds of dimension $n$ and $m$. How to prove M diffeomorph to N only if $m=n$

functional-analysis functions

asked Apr 3, 2017 at 10:01

2 votes

0 answers

214 views

Exponentiation of a vector field

differential-geometry

asked Apr 5, 2017 at 16:20

2 votes

1 answer

3k views

Haar measure and SU(2)

group-theory lie-groups haar-measure

asked Jun 12, 2017 at 16:51

2 votes

2 answers

1k views

Is any representation equivalent to a unitary one?

linear-algebra representation-theory

asked Jun 22, 2017 at 22:29

2 votes

1 answer

700 views

A book on Lie Algebras with proofs but written for physicists

book-recommendation

asked May 16, 2017 at 11:13

2 votes

1 answer

118 views

Vector space spanned by a non finite family of vectors

linear-algebra

asked May 2, 2017 at 19:08

2 votes

2 answers

181 views

$C^k$ manifold : question about the definition

differential-geometry

asked Aug 21, 2017 at 15:33

2 votes

0 answers

21 views

Isomorph to Lie Algebra and stability of the commutator

lie-algebras

asked Nov 22, 2017 at 9:31

2 votes

0 answers

67 views

Conditionnal entropy : intuitive interpretation

information-theory entropy

asked Feb 10, 2019 at 21:08

2 votes

1 answer

71 views

Why do we have $\int_{t_0}^t \delta(t-t') c(t')=\frac{1}{2} c(t)$?

fourier-transform distribution-theory dirac-delta

asked Mar 28, 2019 at 13:01

2 votes

0 answers

149 views

p-form and Maxwell equations

differential-geometry tensors

asked Aug 20, 2017 at 18:09

2 votes

0 answers

349 views

Why is $ds^2=dx^2+dy^2$ enough accurate for integration?

integration differential-geometry

asked Aug 17, 2017 at 18:16

2 votes

3 answers

736 views

Transformations law for tensor: why $\partial_{\mu} A^{\nu}$ is not a well defined tensor ? Where is my mistake.

differential-geometry

asked Dec 24, 2019 at 22:16

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97 Questions

Fock space used in Quantum mechanic : how can we have direct sum of spaces of different dimensions?

Push forward or differential : is there a link with the differential of a function?

"Smooth" tensor field

A nice book on representation of groups (not too theoretical, for physisicts purposes)

Let $G$ be a Lie group. How to prove that $G/H$ is a manifold?

Irreducible representations of $su2$ in dimension $d$ : how do we know it exists?

Peter Weyl theorem in $SU(2)$ : basis of $L_2[SU(2)]$

Eigenvalues of tensor product of matrices : question about general properties

Why is the infinite period Fourier series the Fourier transform?

Question about the physical intuition behind tensors

Pull-back of a differential : I get confused with the variables

Misunderstanding on maximal atlas

How to go from Lie Algebra representation to group representation?

Maximum number of irreducible representation of finite group

Difference of vectors living in different tangent spaces

Surface of revolution between two circles

Good and bad tensors (and the metric)

Let $f : M \rightarrow N$ where $M$ and $N$ are manifolds of dimension $n$ and $m$. How to prove M diffeomorph to N only if $m=n$

Exponentiation of a vector field

Haar measure and SU(2)

Is any representation equivalent to a unitary one?

A book on Lie Algebras with proofs but written for physicists

Vector space spanned by a non finite family of vectors

$C^k$ manifold : question about the definition

Isomorph to Lie Algebra and stability of the commutator

Conditionnal entropy : intuitive interpretation

Why do we have $\int_{t_0}^t \delta(t-t') c(t')=\frac{1}{2} c(t)$?

p-form and Maxwell equations

Why is $ds^2=dx^2+dy^2$ enough accurate for integration?

Transformations law for tensor: why $\partial_{\mu} A^{\nu}$ is not a well defined tensor ? Where is my mistake.