List questions from matrix-equations

Published on 01 Apr 2026 - 12:34

74

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Mathematical notation on a matrix

Published on 15 Apr 2026 - 8:59

162

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Derivative of diagonal matrix expression: $f(X)=\text{diag}(X)M^T\text{diag}^{-1}(MX)$

Published on 29 Apr 2026 - 20:05

119

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Counterexample for a convex problem

Published on 13 Apr 2026 - 7:36

118

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Does $AX+XB=B$ have a unique solution?

Published on 09 Apr 2026 - 13:29

189

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Reverse engineering a matrix in RREF

Published on 29 Apr 2026 - 20:04

80

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How to compute the derivative of this matrix equation

Published on 29 Apr 2026 - 20:57

73

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Decomposition of a group element as a product of a coset and subgroup element

Published on 13 Apr 2026 - 20:32

121

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Finding $x$ from $Ax = b$ with $QR$ factorization

Published on 10 Apr 2026 - 18:28

49

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Rewrite $y(x) = \int_0^x xy(\tau) d\tau + 2x + 1$ as an ODE in the form of $u'(t) = F(t, u(t))$ with the condition $u(t_0) = u_0$

Published on 16 Apr 2026 - 0:58

56

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Calculation step in deriving Hamiltonian from Lagrangian

Published on 10 Apr 2026 - 11:12

137

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If $bc+qr=ca+rp=ab+pq=-1$ then show that $\begin{vmatrix} ap & p & a \\ bq & q & b \\ cr & r & c \\ \end{vmatrix}=0 $

Published on 17 Apr 2026 - 5:04

29

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Multiply two Galois field arrays that do not result in zero

Published on 15 Apr 2026 - 14:35

119

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Optimization method for coefficient matrix in $Ax = b$ with known $x$ and $b$

Published on 12 Apr 2026 - 8:20

58

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Find $\frac{\partial}{\partial a_{i,j}} \left[ \mathbf{c}^T (s \mathbf{I} - \mathbf{A})^{-1} \mathbf{b} \right] $

Published on 15 Apr 2026 - 18:03

List Question

Combining two fundamental matrices

Mathematical notation on a matrix

Derivative of diagonal matrix expression: $f(X)=\text{diag}(X)M^T\text{diag}^{-1}(MX)$

Counterexample for a convex problem

Does $AX+XB=B$ have a unique solution?

Reverse engineering a matrix in RREF

How to compute the derivative of this matrix equation

Decomposition of a group element as a product of a coset and subgroup element

Finding $x$ from $Ax = b$ with $QR$ factorization

Rewrite $y(x) = \int_0^x xy(\tau) d\tau + 2x + 1$ as an ODE in the form of $u'(t) = F(t, u(t))$ with the condition $u(t_0) = u_0$

Calculation step in deriving Hamiltonian from Lagrangian

If $bc+qr=ca+rp=ab+pq=-1$ then show that $\begin{vmatrix} ap & p & a \\ bq & q & b \\ cr & r & c \\ \end{vmatrix}=0 $

Multiply two Galois field arrays that do not result in zero

Optimization method for coefficient matrix in $Ax = b$ with known $x$ and $b$

Find $\frac{\partial}{\partial a_{i,j}} \left[ \mathbf{c}^T (s \mathbf{I} - \mathbf{A})^{-1} \mathbf{b} \right] $

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