Question

Is the the set of symmetric positive-definite matrices in the space of all symmetric matrices strictly convex?

score 1k · Answer 1 · 2026-04-16 11:08:31

1k

Views

Is the the set of symmetric positive-definite matrices in the space of all symmetric matrices strictly convex?

Published on 16 Apr 2026 - 11:08

score 6.7k · Answer 2 · 2026-04-14 18:03:30

6.7k

Views

Why does positive (semi-)definiteness imply convexity?

Published on 14 Apr 2026 - 18:03

score 351 · Answer 3 · 2026-04-15 10:24:03

351

Views

The Proximal Operator and the Sub Differential of the $ {L}_{2} $ Norm of a Matrix

Published on 15 Apr 2026 - 10:24

score 99 · Answer 4 · 2026-04-13 13:40:35

99

Views

Which of These Definitions Is Correct for a Proximal Operator?

Published on 13 Apr 2026 - 13:40

score 516 · Answer 5 · 2026-04-16 11:16:27

516

Views

Proximal Operator / Mapping of $ g \left( x \right) = {\left\| x \right\|}_{1} $ ($ {L}_{1} $ Norm) in the Complex Domain

Published on 16 Apr 2026 - 11:16

score 125 · Answer 6 · 2026-04-24 11:22:20

125

Views

Finding a convex set that approaches a boundary point

Published on 24 Apr 2026 - 11:22

score 29 · Answer 7 · 2026-04-13 04:05:12

29

Views

Projection onto a convex subset, need help proving some identities

Published on 13 Apr 2026 - 4:05

score 814 · Answer 8 · 2026-04-17 15:28:42

814

Views

What is the smooth approximation of group lasso penalty?

Published on 17 Apr 2026 - 15:28

score 284 · Answer 9 · 2026-04-11 14:23:54

284

Views

What is the geometric difference between Gamma regularization and convex conjugate?

Published on 11 Apr 2026 - 14:23

score 26 · Answer 10 · 2026-04-08 21:22:12

26

Views

the question about the closed nest

Published on 08 Apr 2026 - 21:22

score 130 · Answer 11 · 2026-04-16 12:58:17

130

Views

If $A\subset X$, and $\partial A$ and $X$ are connected, then $\operatorname{Cl}(A)$ is connected.

Published on 16 Apr 2026 - 12:58

score 4.9k · Answer 12 · 2026-04-09 06:10:34

4.9k

Views

How to calculate set of subgradients

Published on 09 Apr 2026 - 6:10

score 51 · Answer 13 · 2026-04-12 10:26:32

51

Views

How to verify the subhomogenity of multivariate function $f(x, y)$?

Published on 12 Apr 2026 - 10:26

score 25 · Answer 14 · 2026-04-11 08:22:59

25

Views

Why are these functions increasing/decreasing

Published on 11 Apr 2026 - 8:22

score 93 · Answer 15 · 2026-04-11 17:12:19

93

Views

Convex function with 3 aligned points are affines

Published on 11 Apr 2026 - 17:12

List Question

Is the the set of symmetric positive-definite matrices in the space of all symmetric matrices strictly convex?

Why does positive (semi-)definiteness imply convexity?

The Proximal Operator and the Sub Differential of the $ {L}_{2} $ Norm of a Matrix

Which of These Definitions Is Correct for a Proximal Operator?

Proximal Operator / Mapping of $ g \left( x \right) = {\left\| x \right\|}_{1} $ ($ {L}_{1} $ Norm) in the Complex Domain

Finding a convex set that approaches a boundary point

Projection onto a convex subset, need help proving some identities

What is the smooth approximation of group lasso penalty?

What is the geometric difference between Gamma regularization and convex conjugate?

the question about the closed nest

If $A\subset X$, and $\partial A$ and $X$ are connected, then $\operatorname{Cl}(A)$ is connected.

How to calculate set of subgradients

How to verify the subhomogenity of multivariate function $f(x, y)$?

Why are these functions increasing/decreasing

Convex function with 3 aligned points are affines

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