A least-squares lower bound for capacity

Thomas Ransford

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arXiv · 2610.24702

A least-squares lower bound for capacity

Thomas Ransford

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Abstract

We establish a least-squares lower bound for the logarithmic capacity of an arbitrary compact plane set, extending an inequality previously known for connected sets. The bound generalizes classical inequalities involving area and moment of inertia. It is sharp for disks, and asymptotically sharp for compact sets whose capacity coincides with that of their interior. We further show that asymptotic sharpness holds for general compact sets if we replace logarithmic capacity by minimal carrier capacity.

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Thomas Ransford. 2026-10-17. A least-squares lower bound for capacity. https://arxiv.org/abs/2610.24702

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