Volume-ratio conjecture for linear images of the Schatten-1 ball

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Let M:Rd×d→?M:\mathbb{R}^{d\times d}\to\boxed{?} be a linear map, and let

S1d:={A∈Rd×d:∥A∥∗≤1}\mathcal S^d_1:=\{A\in\mathbb{R}^{d\times d}:\|A\|_*\le 1\}

be the Schatten-1 ball. Volume-ratio conjecture. Is it true that

vr⁡(MS1d)≲1?\operatorname{vr}(M\mathcal S^d_1)\lesssim 1?

A positive answer would give an O(d)O(\sqrt d) partial-coloring bound for the Matrix Spencer setting. The source presents this as an open problem; no resolution is supplied.

References

Primary source

Victor Reis, “Optimal Vector Balancing for Zonotopes”, arXiv:2605.23866 (2026).

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