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7 votes
1 answer
416 views

Nondifferentiable convex function whose subdifferential admits a continuous selection

Is there a convex function $F$ that is not differentiable, but whose subdifferential admits a continuous selection, i.e. a continuous $g$ with $g(x) \in \partial F(x)$ for all $x$ in the domain? In on …
usul's user avatar
  • 4,529
4 votes
2 answers
697 views

Existence of a strictly convex function interpolating given gradients and values

I'm wondering where to find a proof and reference for the following facts, which I feel sure must be true. (1) Suppose we are given a finite set of points in $\mathbb{R}^{d+1}$. For each point, we ar …
usul's user avatar
  • 4,529
3 votes

Example of a (strictly) proper scoring rule on a general measurable space?

Turns out that Gneiting and Raftery give an example in Section 4.2 of the continuous ranked probability score (CRPS), which is strictly proper for $\mathcal{P}$ equal to the Borel probability measures …
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2 votes

Example of a (strictly) proper scoring rule on a general measurable space?

Well, it might be important to limit $\mathcal{P}$ here. If we consider the space $\Omega = \mathbb{R}$ with Lebesgue measure, we might take $\mathcal{P}$ to be the set of distributions with a continu …
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