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arxiv: 1505.05817 · v1 · pith:HAIEXG3Mnew · submitted 2015-05-21 · 🧮 math.MG

Counterexamples Related to Rotations of Shadows of Convex Bodies

classification 🧮 math.MG
keywords containedrotatedbodiesconvexdimensionalprojectioncannotconditions
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We construct examples of two convex bodies $K,L$ in $\mathbb{R}^n$, such that every projection of $K$ onto a $(n-1)$-dimensional subspace can be rotated to be contained in the corresponding projection of $L$, but $K$ itself cannot be rotated to be contained in $L$. We also find necessary conditions on $K$ and $L$ to ensure that $K$ can be rotated to be contained in $L$ if all the $(n-1)$-dimensional projections have this property.

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