On bodies in mathbb{R}⁵ with directly congruent projections or sections
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🧮 math.MG
keywords
projectionsbodiescongruentdimensionaldirectlymathbbsectionssubspaces
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Let $K$ and $L$ be two convex bodies in ${\mathbb R^5}$ with countably many diameters, such that their projections onto all $4$ dimensional subspaces containing one fixed diameter are directly congruent. We show that if these projections have no rotational symmetries, and the projections of $K,L$ on certain 3 dimensional subspaces have no symmetries, then $K=\pm L$ up to a translation. We also prove the corresponding result for sections of star bodies.
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