Question

Existence of an isotropic vector orthogonal to a given one in a vector space over a finite field.

score 480 · Answer 1 · 2026-05-10 17:16:38

480

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Existence of an isotropic vector orthogonal to a given one in a vector space over a finite field.

Published on 10 May 2026 - 17:16

score 1.2k · Answer 2 · 2026-04-12 18:59:02

1.2k

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Quadratic Form - Finding the Coefficient matrix

Published on 12 Apr 2026 - 18:59

score 68 · Answer 3 · 2026-04-14 13:50:20

68

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Is this quadratic form of any use to rule out ec-numbers to be prime?

Published on 14 Apr 2026 - 13:50

score 68 · Answer 4 · 2026-04-16 03:44:36

Prove that the center of the ellipse $Ax^2+Bxy+Cy^2+Dx+Ey+F=0$, where $A, B, C, D, E>0$, is not in the first quadrant of the $xy$-plane?

score 5.7k · Answer 5 · 2026-04-14 22:37:07

5.7k

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If $x^TAx$ = $x^TBx$ for all $x\in \mathbb R^n$. Then what can I say about the matrices? Are they congruent to each other?

Published on 14 Apr 2026 - 22:37

score 323 · Answer 6 · 2026-04-14 06:01:35

323

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On problem regarding the quadratic form $yx+z^2$.

Published on 14 Apr 2026 - 6:01

score 39 · Answer 7 · 2026-04-13 00:33:08

39

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Can we say any matrix whose quadratic form is $xy + z^2$ can be diagonalised to a Matrix who has two positive and one negative Eigen value?

Published on 13 Apr 2026 - 0:33

score 223 · Answer 8 · 2026-04-13 22:47:37

223

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Maximum of Quadratic form

Published on 13 Apr 2026 - 22:47

score 1.6k · Answer 9 · 2026-05-10 15:02:38

1.6k

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Find the extrema of $\sin(x)\cos(y)$ with the Hessian

Published on 10 May 2026 - 15:02

score 162 · Answer 10 · 2026-04-14 18:03:24

162

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On a statement in The Joy of Factoring By Samuel S. Wagstaff (Jr.)?

Published on 14 Apr 2026 - 18:03

score 66 · Answer 11 · 2026-04-11 13:59:49

66

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How to factorize a quadratic expression with an extra constant?

Published on 11 Apr 2026 - 13:59

score 97 · Answer 12 · 2026-04-15 04:15:32

97

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Why does $x + x = \dfrac{(-b)}{2a}$ not work fo both of the roots?

Published on 15 Apr 2026 - 4:15

score 397 · Answer 13 · 2026-04-16 11:00:32

397

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For what prime $p$ does this quadratic form represent $0$?

Published on 16 Apr 2026 - 11:00

score 51 · Answer 14 · 2026-04-17 11:52:13

51

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Determinant-of-Determinants Form equivalent of $\mathbf{ x^T Q x}$

Published on 17 Apr 2026 - 11:52

score 27 · Answer 15 · 2026-04-17 01:26:57

27

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Quadratic forms $q_1, ... ,q_d : \mathbb{C}^n \rightarrow \mathbb{C}$ have a common zero if $n \geq 2^d$

Published on 17 Apr 2026 - 1:26

List Question

Existence of an isotropic vector orthogonal to a given one in a vector space over a finite field.

Quadratic Form - Finding the Coefficient matrix

Is this quadratic form of any use to rule out ec-numbers to be prime?

Prove that the center of the ellipse $Ax^2+Bxy+Cy^2+Dx+Ey+F=0$, where $A, B, C, D, E>0$, is not in the first quadrant of the $xy$-plane?

If $x^TAx$ = $x^TBx$ for all $x\in \mathbb R^n$. Then what can I say about the matrices? Are they congruent to each other?

On problem regarding the quadratic form $yx+z^2$.

Can we say any matrix whose quadratic form is $xy + z^2$ can be diagonalised to a Matrix who has two positive and one negative Eigen value?

Maximum of Quadratic form

Find the extrema of $\sin(x)\cos(y)$ with the Hessian

On a statement in The Joy of Factoring By Samuel S. Wagstaff (Jr.)?

How to factorize a quadratic expression with an extra constant?

Why does $x + x = \dfrac{(-b)}{2a}$ not work fo both of the roots?

For what prime $p$ does this quadratic form represent $0$?

Determinant-of-Determinants Form equivalent of $\mathbf{ x^T Q x}$

Quadratic forms $q_1, ... ,q_d : \mathbb{C}^n \rightarrow \mathbb{C}$ have a common zero if $n \geq 2^d$

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