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Functional analysis

A counterexample to metric-entropy duality

OpenAI research collection · 1 manuscript · Source checked 2026-10-19

OpenAI's result summary

Disproves Pietsch's dimension-free duality conjecture for metric entropy. Origin-symmetric convex bodies violate every proposed choice of universal constants in the conjectured comparison between covering numbers and those of the polar bodies, even when the covering body is a cube.

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MANUSCRIPT 01

Counterexamples to the duality conjecture for metric entropy

We disprove Pietsch's dimension-free duality conjecture for metric entropy. For every proposed pair of universal constants, we construct origin-symmetric convex bodies that violate the corresponding covering-entropy inequality, already when the covering body is a cube.

This PDF is listed in OpenAI's formalization catalogue. See the scope and dependencies before interpreting coverage.

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