User Korf

5 votes

Accepted

Why is easier to get inverse of mass matrix?

answered Feb 25 at 16:09

0 votes

Determine Functions of a Reference Triangle for Finite Element

answered Feb 25 at 14:57

2 votes

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Why do mathematicians use BDM or Hdiv finite elements to solve the Mixed Poisson partial differential equation

answered Sep 7, 2023 at 12:13

1 vote

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FEM with no homogeneous Dirichlet boundary conditions

answered May 11, 2023 at 11:50

7 votes

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What is the relation between the gaussian integral and the volume of the n-ball?

answered Mar 4, 2016 at 16:13

1 vote

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General inverse of constant correlation matrix

answered Apr 25, 2022 at 13:29

1 vote

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How to discretize the trilinear form $m(w;,u,v) := \int_\Omega w^{2p} u \ v$ to get a matrix for FEM methods

answered Oct 7, 2021 at 10:01

1 vote

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Matrix exponential of an upper triangular matrix

answered Sep 10, 2021 at 9:31

3 votes

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Why is $\delta\mathbf{u}\cdot \mathrm{div}(\mathbf{\sigma}) = -\mathrm{grad}(\delta\mathbf{u}) \mathbf{:} \mathbf{\sigma}$?

answered Sep 8, 2021 at 13:37

1 vote

If $x$ and $y$ are two linearly independent column $n$-vectors how can I find all the eigenvalues of $xx^{T}-yy^{T}$

answered Oct 26, 2020 at 10:04

0 votes

Numerical integration in Finite Element Method (and implementation in Matlab)?

answered Nov 15, 2018 at 9:39

2 votes

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Existence of closed solution of a certain type of Poisson equations

answered Aug 13, 2018 at 12:02

1 vote

Eigenspectrum of $M = A S A^T$

answered May 24, 2018 at 10:56

0 votes

tensor product, isotropic

answered May 23, 2018 at 13:13

0 votes

Integral of $\| \vec{x} \|^2$ over unit ball in $\mathbb{R}^n$

answered Mar 2, 2016 at 18:33

2 votes

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Rank of a block matrix

answered Mar 7, 2016 at 12:25

2 votes

prove or disprove if $\|AB - I\|<1$ then $\|BA - I\|<1$

answered Mar 5, 2016 at 0:52

3 votes

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Determinant of $(A+iB)(A-iB)$

answered Feb 29, 2016 at 11:53

1 vote

Trying to explain to first year students that $\det$Diag$(A,B)$ = $\det A \cdot \det B$

answered Feb 28, 2016 at 23:16

1 vote

I get a wrong determinant - why?

answered Feb 26, 2016 at 10:08

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20 Answers

Why is easier to get inverse of mass matrix?

Determine Functions of a Reference Triangle for Finite Element

Why do mathematicians use BDM or Hdiv finite elements to solve the Mixed Poisson partial differential equation

FEM with no homogeneous Dirichlet boundary conditions

What is the relation between the gaussian integral and the volume of the n-ball?

General inverse of constant correlation matrix

How to discretize the trilinear form $m(w;,u,v) := \int_\Omega w^{2p} u \ v$ to get a matrix for FEM methods

Matrix exponential of an upper triangular matrix

Why is $\delta\mathbf{u}\cdot \mathrm{div}(\mathbf{\sigma}) = -\mathrm{grad}(\delta\mathbf{u}) \mathbf{:} \mathbf{\sigma}$?

If $x$ and $y$ are two linearly independent column $n$-vectors how can I find all the eigenvalues of $xx^{T}-yy^{T}$

Numerical integration in Finite Element Method (and implementation in Matlab)?

Existence of closed solution of a certain type of Poisson equations

Eigenspectrum of $M = A S A^T$

tensor product, isotropic

Integral of $\| \vec{x} \|^2$ over unit ball in $\mathbb{R}^n$

Rank of a block matrix

prove or disprove if $\|AB - I\|<1$ then $\|BA - I\|<1$

Determinant of $(A+iB)(A-iB)$

Trying to explain to first year students that $\det$Diag$(A,B)$ = $\det A \cdot \det B$

I get a wrong determinant - why?