Author

Matteo Russo

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Preprint Oct 2026

The Online Steinitz Problem

Inspired by Steinitz's celebrated result (1913) and recent online vector-balancing results of Kulkarni et al. (2024) and Aden-Ali (2026), we introduce the online Steinitz problem: $T$ vectors in $\mathbb R^d$, each of $\ell_2$-norm at most $1$ and with total sum zero, arrive one at a time and must be assigned immediate...

Matteo Russo, Jia-Ye Wei · 0 citations

Preprint Sep 2026

Moment Ambiguity and the Limits of Robust Stochastic Optimization

We study fundamental information-theoretic limits of robust stochastic optimization when the distribution is known only through its exact moment sequence. We develop a unified framework that produces families of distinct distributions sharing all moments yet inducing radically different optimal decisions, thereby estab...

Andrés Cristi, Matteo Russo, Jie-Chen Zhang · 0 citations