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arXiv · 2512.13555

Extensions of the Busemann-Petty Problem for Arbitrary Measures

Daniel Galicer·Julián Haddad·Joaquín Singer
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Abstract

The classical Busemann--Petty problem asks whether smaller central hyperplane sections of origin-symmetric convex bodies imply smaller total volume. Zvavitch studied the analogous question when sections and bodies are measured by two arbitrary densities. We refine this result in three directions: we allow central sections of arbitrary codimension; we relax the monotonicity requirement on the radial density ratio to a decomposition into a non-decreasing and a non-increasing part; and we permit a distinct pair of densities for each body, one for the sections and another for the full volume. We also obtain an isomorphic version, in which the comparison constant is governed by the distance from an auxiliary star body to the class of generalized $k$-intersection bodies, and we present some examples illustrating cases not covered by previous results.

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Daniel Galicer, Julián Haddad, Joaquín Singer. 2025-12-15. Extensions of the Busemann-Petty Problem for Arbitrary Measures. https://arxiv.org/abs/2512.13555

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