List questions from quadratic-forms

170

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how many points belong to the quadric $x_0^2+x_1^2+x_2^2+x_3^2=0$ in $\mathbb{P}_3$ over $\mathbb{F}_9$

Published on 25 Mar 2026 - 1:18

766

Views

Hessian and quadratic form

Published on 25 Mar 2026 - 12:16

69

Views

Signature of a bilinear form in the space of $2 \times 2$ Hermitian matrices

Published on 08 May 2019 - 4:19

169

Views

Positive-definite over $\mathbb Q$ form is positive definite over $\mathbb R$?

Published on 10 May 2019 - 9:03

4.2k

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Derivative of a quadratic form — how to derive it?

Published on 11 May 2019 - 17:10

344

Views

Сanonical form of a quadratic form by Lagrange's method

Published on 11 May 2019 - 18:52

151

Views

Representation by a quadratic binary form

Published on 12 May 2019 - 10:12

149

Views

Quadratic form, Lagrange method

Published on 16 May 2019 - 15:01

81

Views

Question about "Primes of the form $x^2+ny^2$": Proper ideals are invertible

Published on 16 May 2019 - 19:15

72

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Solve $x \circ a + x \circ (Bx) + c = 0$ for $x$?

Published on 25 Mar 2026 - 14:32

41

Views

ternary quadratic forms over polynomial rings

Published on 17 May 2019 - 2:54

212

Views

Quadratic form vanishing at certain points

Published on 17 May 2019 - 22:03

210

Views

Is it easy to check if two matrices define the same quadratic form over $\mathbb{Z}$?

Published on 18 May 2019 - 15:26

26

Views

How to find the projection along the following vector subspace?

Published on 26 Mar 2026 - 1:28

97

Views

Gradient of an $n$-variate quadratic form

Published on 23 May 2019 - 15:47

List Question

how many points belong to the quadric $x_0^2+x_1^2+x_2^2+x_3^2=0$ in $\mathbb{P}_3$ over $\mathbb{F}_9$

Hessian and quadratic form

Signature of a bilinear form in the space of $2 \times 2$ Hermitian matrices

Positive-definite over $\mathbb Q$ form is positive definite over $\mathbb R$?

Derivative of a quadratic form — how to derive it?

Сanonical form of a quadratic form by Lagrange's method

Representation by a quadratic binary form

Quadratic form, Lagrange method

Question about "Primes of the form $x^2+ny^2$": Proper ideals are invertible

Solve $x \circ a + x \circ (Bx) + c = 0$ for $x$?

ternary quadratic forms over polynomial rings

Quadratic form vanishing at certain points

Is it easy to check if two matrices define the same quadratic form over $\mathbb{Z}$?

How to find the projection along the following vector subspace?

Gradient of an $n$-variate quadratic form

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