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4 votes
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Regularity of convex sets in $\mathbb{R}^n$

Theorem 1.3 in: https://arxiv.org/pdf/1304.4179.pdf and the historical discussion below it is relevant. The result (in a form that applies without the convexity assumption) seems to first appear in 19 …
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5 votes
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For most directions does the supporting hyperplane meeting a bounded convex set meet it in o...

The support function of $C$, restricted to the unit sphere, is differentiable exactly at directions such that (the relevant) hyperplane normal to that direction has a single contact point with $C$. Be …
alesia's user avatar
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8 votes
Accepted

On the convex cone of convex functions

The Laplacian measure of a function in the closure of $G$ is the weak limit of linear combinations of the Laplacian measures of your elementary functions, whose support are "tripods", that is, unions …
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5 votes
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$\arg\max$ in the dual norm of the nuclear norm

The answer is $X^* = uv^*$ where $u$ and $v$ are the left and right singular vectors of $M$ associated with the largest singular value. If the largest singular value has multiplicity larger than $1$, …
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  • 2,772