Question

The convexity of the norm is equivalent to Schwartz inequality.

score 92 · Answer 1 · 2026-04-15 10:20:58

92

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The convexity of the norm is equivalent to Schwartz inequality.

Published on 15 Apr 2026 - 10:20

score 569 · Answer 2 · 2026-04-15 10:42:19

569

Views

Matrix gradient of $\ln(\det(X))$

Published on 15 Apr 2026 - 10:42

score 43 · Answer 3 · 2026-04-13 18:01:30

43

Views

How to prove this statement in calculus

Published on 13 Apr 2026 - 18:01

score 22 · Answer 4 · 2026-04-14 15:19:40

Through the point $M(1,3)$, draw a straight line so that it cuts off in the first quadrant a rectangular triangle having a smaller hypotenuse.

score 60 · Answer 5 · 2026-04-16 12:17:01

60

Views

Unit vector and commutator $\left[ S_zB_z,S_x \hat{x} \right]-\left[S_y \hat{y},S_zB_z \right]+\left[ S_zB_z,S_z \hat{z} \right]$

Published on 16 Apr 2026 - 12:17

score 157 · Answer 6 · 2026-04-09 06:37:23

157

Views

Confusion About Differentiability of Function

Published on 09 Apr 2026 - 6:37

score 445 · Answer 7 · 2026-04-09 10:46:47

445

Views

Differentiate without using chain rule

Published on 09 Apr 2026 - 10:46

score 84 · Answer 8 · 2026-04-24 02:27:01

84

Views

For which (constant) values $p$ and $q$, all the solutions of equation: $x''+px'+qx=0$ go to $0$ at $t \to +\infty$

Published on 24 Apr 2026 - 2:27

score 1.1k · Answer 9 · 2026-04-14 11:38:42

1.1k

Views

Direct proof of maximum of a function implying that the derivative is zero?

Published on 14 Apr 2026 - 11:38

score 294 · Answer 10 · 2026-04-10 11:19:01

294

Views

Solving Riccati(?) Equation

Published on 10 Apr 2026 - 11:19

score 296 · Answer 11 · 2026-04-14 00:54:47

296

Views

How do I compute the matrix gradient with respect to a submatrix by applying the chain rule?

Published on 14 Apr 2026 - 0:54

score 121 · Answer 12 · 2026-04-13 15:29:49

121

Views

Derivative of a complex function $y=(\tan{2x})^{\cot{(\frac{x}{2})}}$

Published on 13 Apr 2026 - 15:29

score 17.4k · Answer 13 · 2026-04-20 06:30:52

17.4k

Views

Why is the derivative important?

Published on 20 Apr 2026 - 6:30

score 50 · Answer 14 · 2026-04-28 11:17:18

50

Views

Finding $a_i:U→\mathbb R$ of class $C^{k-1}$ such that $f(x,y)=\sum\limits_{j=0}^ia_j(x,y)x^jy^{i-j}$

Published on 28 Apr 2026 - 11:17

score 77 · Answer 15 · 2026-04-24 02:27:39

77

Views

If all partial derivatives 0f $f:\mathbb{R^2}\rightarrow \mathbb{R}$ equal $0$ at $(x,y)$ then $f$ is not injective in neighborhood of $(x,y)$

Published on 24 Apr 2026 - 2:27

List Question

The convexity of the norm is equivalent to Schwartz inequality.

Matrix gradient of $\ln(\det(X))$

How to prove this statement in calculus

Through the point $M(1,3)$, draw a straight line so that it cuts off in the first quadrant a rectangular triangle having a smaller hypotenuse.

Unit vector and commutator $\left[ S_zB_z,S_x \hat{x} \right]-\left[S_y \hat{y},S_zB_z \right]+\left[ S_zB_z,S_z \hat{z} \right]$

Confusion About Differentiability of Function

Differentiate without using chain rule

For which (constant) values $p$ and $q$, all the solutions of equation: $x''+px'+qx=0$ go to $0$ at $t \to +\infty$

Direct proof of maximum of a function implying that the derivative is zero?

Solving Riccati(?) Equation

How do I compute the matrix gradient with respect to a submatrix by applying the chain rule?

Derivative of a complex function $y=(\tan{2x})^{\cot{(\frac{x}{2})}}$

Why is the derivative important?

Finding $a_i:U→\mathbb R$ of class $C^{k-1}$ such that $f(x,y)=\sum\limits_{j=0}^ia_j(x,y)x^jy^{i-j}$

If all partial derivatives 0f $f:\mathbb{R^2}\rightarrow \mathbb{R}$ equal $0$ at $(x,y)$ then $f$ is not injective in neighborhood of $(x,y)$

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