List questions from convex-analysis

Published on 23 Apr 2026 - 15:13

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Conjuction big sign

Published on 11 Apr 2026 - 16:34

693

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Convex Differentiable Non-Increasing Function is smaller than derivative at zero

Published on 12 Apr 2026 - 21:45

48

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Is there a comparison between these two functions?

Published on 13 Apr 2026 - 10:41

72

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Can a matrix be translated by a diagonal matrix to obtain a singular matrix?

Published on 12 Apr 2026 - 15:15

69

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Suppose $f$ is convex and nonincreasing. When is $f(|\cdot|)$ convex?

Published on 15 Apr 2026 - 1:35

1.2k

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Sub-gradient and super-gradient are bounded implies globally Lipschitz.

Published on 17 Apr 2026 - 11:13

60

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Why is $f (x) = x' Q x + c x + b$ convex if $Q$ is PSD?

Published on 17 Apr 2026 - 12:44

467

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The convexity of a function $e^{x+y}$

Published on 15 Apr 2026 - 13:46

1.3k

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How to determine if a function or set is convex?

Published on 10 Apr 2026 - 23:45

711

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Seeking a method for finding feasible directions

Published on 11 Apr 2026 - 18:12

97

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On the convexity of $-\int_0^t\Re\frac{\eta' \left( 1/2+ix \right) }{\eta \left( 1/2+ix \right) }dx,$ for $t>0$

Published on 18 Apr 2026 - 12:57

38

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Approximation in a convex subset

Published on 14 Apr 2026 - 21:25

59

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Is $A = \{ (z_1 , z_2) \in \mathbb{C}^2 : |z_1| \leq |z_2|\}$ an absorbing, balanced and convex set?

Published on 15 Apr 2026 - 2:37

1.2k

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Closure of a function

Published on 12 Apr 2026 - 19:35

List Question

If $M$ is convex, prove that $M^\circ$ and $\bar M$ are convex

Conjuction big sign

Convex Differentiable Non-Increasing Function is smaller than derivative at zero

Is there a comparison between these two functions?

Can a matrix be translated by a diagonal matrix to obtain a singular matrix?

Suppose $f$ is convex and nonincreasing. When is $f(|\cdot|)$ convex?

Sub-gradient and super-gradient are bounded implies globally Lipschitz.

Why is $f (x) = x' Q x + c x + b$ convex if $Q$ is PSD?

The convexity of a function $e^{x+y}$

How to determine if a function or set is convex?

Seeking a method for finding feasible directions

On the convexity of $-\int_0^t\Re\frac{\eta' \left( 1/2+ix \right) }{\eta \left( 1/2+ix \right) }dx,$ for $t>0$

Approximation in a convex subset

Is $A = \{ (z_1 , z_2) \in \mathbb{C}^2 : |z_1| \leq |z_2|\}$ an absorbing, balanced and convex set?

Closure of a function

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