仿射等价投影的凸体与仿射旋转体
Convex Bodies with affinely equivalent projections and affine bodies of revolution
摘要：
本文研究仿射旋转体。这将使我们能够证明，一个凸体的正交$n$ -投影是仿射等价的是一个椭球，提供$n\equiv 0,1, 2$ mod $4$，$n>1$与可能的豁免$n=133$。我们的证明使用凸几何和紧李群的拓扑。AMS分类主题：22 E10、52 A05
英文摘要：
Abstract In this paper, we study affine bodies of revolution. This will allow us to prove that a convex body all whose orthogonal $n$-projections are affinely equivalent is an ellipsoid, provided $n\equiv 0,1, 2$ mod $4$, $n>1$ with the possible exemption of $n=133$. Our proof uses convex geometry and topology of compact Lie groups. AMS classification subject: 22E10, 52A05
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