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Busemann's theorem : ウィキペディア英語版
Busemann's theorem
In mathematics, Busemann's theorem is a theorem in Euclidean geometry and geometric tomography. It was first proved by Herbert Busemann in 1949 and was motivated by his theory of area in Finsler spaces.
==Statement of the theorem==

Let ''K'' be a convex body in ''n''-dimensional Euclidean space R''n'' containing the origin in its interior. Let ''S'' be an (''n'' − 2)-dimensional linear subspace of R''n''. For each unit vector ''θ'' in ''S'', the orthogonal complement of ''S'', let ''S''''θ'' denote the (''n'' − 1)-dimensional hyperplane containing ''θ'' and ''S''. Define ''r''(''θ'') to be the (''n'' − 1)-dimensional volume of ''K'' ∩ ''S''''θ''. Let ''C'' be the curve in ''S''. Then ''C'' forms the boundary of a convex body in ''S''.

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