Centered bodies and dual mixed volumes

Zhang, Gao Yong

doi:10.1090/S0002-9947-1994-1254193-9

Centered bodies and dual mixed volumes
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Trans. Amer. Math. Soc. 345 (1994), 777-801 Request permission

Abstract:

We establish a number of characterizations and inequalities for intersection bodies, polar projection bodies and curvature images of projection bodies in ${{\mathbf {R}}^n}$ by using dual mixed volumes. One of the inequalities is between the dual Quermassintegrals of centered bodies and the dual Quermassintegrals of their central $(n - 1)$-slices. It implies Lutwak’s affirmative answer to the Busemann-Petty problem when the body with the smaller sections is an intersection body. We introduce and study the intersection body of order i of a star body, which is dual to the projection body of order i of a convex body. We show that every sufficiently smooth centered body is a generalized intersection body. We discuss a type of selfadjoint elliptic differential operator associated with a convex body. These operators give the openness property of the class of curvature functions of convex bodies. They also give an existence theorem related to a well-known uniqueness theorem about deformations of convex hypersurfaces in global differential geometry.

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