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12 votes

3 answers

4k views

An example of non-closed subspace of a Hilbert space?

asked Dec 8, 2014 at 14:59

7 votes

2 answers

2k views

Completeness of solutions and the separation of variables method

asked Feb 25, 2015 at 22:25

6 votes

0 answers

106 views

a geometric problem about area [duplicate]

asked Aug 31, 2017 at 7:21

5 votes

1 answer

265 views

Why only densely defined operators can have an adjoint operator?

asked Dec 8, 2014 at 20:37

5 votes

2 answers

64 views

How to prove this simple fact without using distribution theory?

asked Mar 5, 2015 at 10:16

5 votes

1 answer

763 views

How to numerically compute the eigenvalues of the Laplacian in a triangular domain with Dirichlet boundary condition?

asked Jul 23, 2014 at 21:16

5 votes

1 answer

267 views

Any article expounding the difference between matrix analysis and functional analysis?

asked Aug 15, 2014 at 12:35

4 votes

1 answer

70 views

Summing up the series $\sum_{n=0}^\infty C_{2n}^n r^{2n} $

asked Mar 19, 2019 at 3:16

3 votes

1 answer

53 views

problem with the ode $f' = a \delta (x) f$

asked Mar 19, 2020 at 23:18

2 votes

2 answers

124 views

Why $L_X \circ d = d \circ L_X$?

asked Oct 12, 2018 at 9:44

2 votes

1 answer

991 views

Laurent expansion of the gamma function at negative integers

asked Apr 21, 2019 at 13:13

2 votes

0 answers

60 views

Differentiability of the function defined by $\sum_{n\geq 1 } \sin n^2 x / n^{5/2} $

asked Apr 13, 2019 at 4:30

2 votes

2 answers

112 views

Asymptotics of $\sum_{n\geq 1 } \frac{\sin n^2 t }{ n^2 } $

asked Apr 16, 2019 at 9:50

2 votes

1 answer

392 views

Simultaneous Diophantine approximation: multiple solutions required

asked Mar 22, 2017 at 12:00

2 votes

0 answers

192 views

Irreducible invariant tensor spaces of the general linear group $GL_n(\mathbb{C})$

asked Dec 16, 2015 at 9:07

2 votes

1 answer

134 views

zeros of a multi-valued function

asked Oct 25, 2016 at 8:06

2 votes

1 answer

848 views

Why is the Mobius transform called a linear transform? [duplicate]

asked Nov 11, 2016 at 14:31

2 votes

2 answers

171 views

Relations similar to $\sin(\pi/18) + \sin(5\pi/18) = \sin(7\pi/18)$

asked Mar 16, 2017 at 0:58

2 votes

2 answers

93 views

What is the simplest way to understand $\nabla \cdot (\nabla \times \textbf{A} ) =0$?

asked Aug 20, 2014 at 20:08

2 votes

0 answers

203 views

kernel space of linear combination of matrices

asked May 26, 2014 at 21:44

2 votes

1 answer

155 views

Any elementary derivation of the Pfaff integrability condition?

asked Jun 21, 2014 at 17:47

2 votes

1 answer

49 views

Why is this distribution Poissonian?

asked Jun 22, 2014 at 10:05

2 votes

0 answers

109 views

What is the symmetry of the Penrose tiling?

asked Jul 23, 2014 at 16:03

2 votes

2 answers

990 views

Any example of non-closed operator?

asked Dec 9, 2014 at 9:38

1 vote

1 answer

76 views

About the von Neumann decomposition

asked Dec 10, 2014 at 15:58

1 vote

2 answers

61 views

A question about the form of the Fredholm theorem

asked Feb 5, 2015 at 10:31

1 vote

0 answers

34 views

How to numerically solve an integral equation with a Cauchy principle kernel?

asked Mar 9, 2015 at 19:37

1 vote

1 answer

317 views

How many zeroes does this transcendental equation have?

asked Oct 23, 2016 at 9:57

1 vote

0 answers

151 views

Completeness of solutions and the separation of variables method

asked Feb 25, 2015 at 22:35

1 vote

1 answer

80 views

What kind of curve can be the branch cut of a complex function?

asked Mar 1, 2015 at 16:47

Stack Exchange Network

45 Questions

An example of non-closed subspace of a Hilbert space?

Completeness of solutions and the separation of variables method

a geometric problem about area [duplicate]

Why only densely defined operators can have an adjoint operator?

How to prove this simple fact without using distribution theory?

How to numerically compute the eigenvalues of the Laplacian in a triangular domain with Dirichlet boundary condition?

Any article expounding the difference between matrix analysis and functional analysis?

Summing up the series $\sum_{n=0}^\infty C_{2n}^n r^{2n} $

problem with the ode $f' = a \delta (x) f$

Why $L_X \circ d = d \circ L_X$?

Laurent expansion of the gamma function at negative integers

Differentiability of the function defined by $\sum_{n\geq 1 } \sin n^2 x / n^{5/2} $

Asymptotics of $\sum_{n\geq 1 } \frac{\sin n^2 t }{ n^2 } $

Simultaneous Diophantine approximation: multiple solutions required

Irreducible invariant tensor spaces of the general linear group $GL_n(\mathbb{C})$

zeros of a multi-valued function

Why is the Mobius transform called a linear transform? [duplicate]

Relations similar to $\sin(\pi/18) + \sin(5\pi/18) = \sin(7\pi/18)$

What is the simplest way to understand $\nabla \cdot (\nabla \times \textbf{A} ) =0$?

kernel space of linear combination of matrices

Any elementary derivation of the Pfaff integrability condition?

Why is this distribution Poissonian?

What is the symmetry of the Penrose tiling?

Any example of non-closed operator?

About the von Neumann decomposition

A question about the form of the Fredholm theorem

How to numerically solve an integral equation with a Cauchy principle kernel?

How many zeroes does this transcendental equation have?

Completeness of solutions and the separation of variables method

What kind of curve can be the branch cut of a complex function?