Question

Does correlation of inverse covariance matrix implies conditional independence?

score 45 · Answer 1 · 2023-09-29 22:01:57

45

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Does correlation of inverse covariance matrix implies conditional independence?

Published on 29 Sep 2023 - 22:01

score 118 · Answer 2 · 2023-09-30 22:05:33

118

Views

Solve an equation with quadratics

Published on 30 Sep 2023 - 22:05

score 88 · Answer 3 · 2026-03-28 02:03:09

88

Views

Vector equation where each element is equal to a quadratic form

Published on 28 Mar 2026 - 2:03

score 53 · Answer 4 · 2026-03-25 07:43:05

53

Views

Proving a system of quadratic forms has no (non-zero) solutions

Published on 25 Mar 2026 - 7:43

score 18 · Answer 5 · 2026-03-20 04:03:09

18

Views

Need a book about complex hermitian matrix and special unitary matrices and their optimization in numerical problems

Published on 20 Mar 2026 - 4:03

score 20 · Answer 6 · 2026-03-25 22:05:07

20

Views

Why is the set of points in $\mathbb{C}P^2$ where a non-degenerated quadratic form vanishes biholomorphic to $\mathbb{C}P^1$?

Published on 25 Mar 2026 - 22:05

score 35 · Answer 7 · 2026-03-27 13:24:25

35

Views

Can you solve $X A X^T = B$ for $X$ over Gaussian rationals in GAP?

Published on 27 Mar 2026 - 13:24

score 52 · Answer 8 · 2023-10-10 18:42:33

52

Views

Algorithm for determining if two ternary quadratic forms are similar

Published on 10 Oct 2023 - 18:42

score 79 · Answer 9 · 2023-10-23 20:08:09

79

Views

Find the minimizer of over $t\in [0,1]$ $\phi((1-t)x+t\frac{Ax}{\|Ax\|})$, where $A$ is positive semidefinite and $\phi$ is quadratic.

Published on 23 Oct 2023 - 20:08

score 43 · Answer 10 · 2023-10-27 21:58:25

43

Views

Determine its definiteness of the quadratic form $x^2_1 - 2x^2_2 + 5x^2_3 + 2x_1x_2 - 6x_2x_3$

Published on 27 Oct 2023 - 21:58

score 13 · Answer 11 · 2023-10-31 23:09:25

13

Views

Likelihood of unbiased estimator of covariance matrix

Published on 31 Oct 2023 - 23:09

score 132 · Answer 12 · 2026-03-28 04:33:17

132

Views

Showing $B-A$ is positive semidefinite

Published on 28 Mar 2026 - 4:33

score 32 · Answer 13 · 2023-11-07 20:37:26

32

Views

Approximations, or bounds for $\mathbb{E}\left[ \|X\|^{-2} \right]$ and $\mathbb{E}\left[\|X\|^{-1} \right]$, $X_i \sim\mathcal{N}(\mu_i, \sigma_i)$

Published on 07 Nov 2023 - 20:37

score 11 · Answer 14 · 2026-03-30 09:41:06

11

Views

How to recognize anisotropic quaternary rational quadratic forms?

Published on 30 Mar 2026 - 9:41

score 57 · Answer 15 · 2026-03-29 18:32:44

57

Views

Show that the solution to $Ax = b$ is a critical points of $f(x)$

Published on 29 Mar 2026 - 18:32

List Question

Does correlation of inverse covariance matrix implies conditional independence?

Solve an equation with quadratics

Vector equation where each element is equal to a quadratic form

Proving a system of quadratic forms has no (non-zero) solutions

Need a book about complex hermitian matrix and special unitary matrices and their optimization in numerical problems

Why is the set of points in $\mathbb{C}P^2$ where a non-degenerated quadratic form vanishes biholomorphic to $\mathbb{C}P^1$?

Can you solve $X A X^T = B$ for $X$ over Gaussian rationals in GAP?

Algorithm for determining if two ternary quadratic forms are similar

Find the minimizer of over $t\in [0,1]$ $\phi((1-t)x+t\frac{Ax}{\|Ax\|})$, where $A$ is positive semidefinite and $\phi$ is quadratic.

Determine its definiteness of the quadratic form $x^2_1 - 2x^2_2 + 5x^2_3 + 2x_1x_2 - 6x_2x_3$

Likelihood of unbiased estimator of covariance matrix

Showing $B-A$ is positive semidefinite

Approximations, or bounds for $\mathbb{E}\left[ \|X\|^{-2} \right]$ and $\mathbb{E}\left[\|X\|^{-1} \right]$, $X_i \sim\mathcal{N}(\mu_i, \sigma_i)$

How to recognize anisotropic quaternary rational quadratic forms?

Show that the solution to $Ax = b$ is a critical points of $f(x)$

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