List questions from convex-analysis

Published on 13 Apr 2026 - 14:26

23

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Convexity of $f(x) = var(max(x, Y))$?

Published on 13 Apr 2026 - 0:50

179

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Fractional constraint to convex constraint

Published on 10 Apr 2026 - 2:42

5.1k

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Definition of subgradient of $1$-norm

Published on 21 Apr 2026 - 6:32

266

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Problem proving property quasi-convexity (quasi-concavity) & optima

Published on 14 Apr 2026 - 19:24

106

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Dual Convex Problem for a Problem including Total Variation

Published on 09 Apr 2026 - 21:11

79

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Projections onto subgradients of convex functions

Published on 12 Apr 2026 - 4:32

197

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Is matrix with entries $a_{ij} = x_ix_j$ positive semidefinite?

Published on 11 Apr 2026 - 19:23

1k

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lambda meaning on the expression $λA+(1−λ)B$

Published on 13 Apr 2026 - 20:21

241

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Strictly convex curves and lines

Published on 14 Apr 2026 - 5:05

163

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Intersection of a properly nested sequence of open convex sets , if non empty and bounded , can never be open ?

Published on 16 Apr 2026 - 14:35

138

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when is $g\circ f$ convex if $g$ is convex and piece-wise linear $f$?

Published on 17 Apr 2026 - 11:23

1.7k

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Convexity of product of two convex functions

Published on 12 Apr 2026 - 10:10

4k

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Derive the dual of the semidefinite program $\max_Y{\rm Tr}(X^T Y)$ subject to $\begin{pmatrix}I&Y\\ Y^T&I\end{pmatrix}\succeq0$

Published on 25 Mar 2026 - 12:49

1.5k

Views

Convexity of a functional - most straightforward way

Published on 08 Apr 2026 - 18:54

List Question

Optimality condition of a convex function that is a.e. differentiable

Convexity of $f(x) = var(max(x, Y))$?

Fractional constraint to convex constraint

Definition of subgradient of $1$-norm

Problem proving property quasi-convexity (quasi-concavity) & optima

Dual Convex Problem for a Problem including Total Variation

Projections onto subgradients of convex functions

Is matrix with entries $a_{ij} = x_ix_j$ positive semidefinite?

lambda meaning on the expression $λA+(1−λ)B$

Strictly convex curves and lines

Intersection of a properly nested sequence of open convex sets , if non empty and bounded , can never be open ?

when is $g\circ f$ convex if $g$ is convex and piece-wise linear $f$?

Convexity of product of two convex functions

Derive the dual of the semidefinite program $\max_Y{\rm Tr}(X^T Y)$ subject to $\begin{pmatrix}I&Y\\ Y^T&I\end{pmatrix}\succeq0$

Convexity of a functional - most straightforward way

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