Euclidean cylinder covering conjecture

Let BnB^n be the Euclidean unit ball, and let Z1,,ZNZ_1,\ldots,Z_N be mm-dimensional Euclidean cylinders covering BnB^n. Write σnm(Zi)\sigma_{n-m}(Z_i) for the (nm)(n-m)-dimensional volume of the cross-section of ZiZ_i. The Euclidean cylinder covering conjecture. Then

i=1Nσnm(Zi)volnm(Bnm)=π(nm)/2Γ((nm)/2+1).\sum_{i=1}^N \sigma_{n-m}(Z_i)\geq \operatorname{vol}_{n-m}(B^{n-m})=\frac{\pi^{(n-m)/2}}{\Gamma((n-m)/2+1)}.

This restates a problem attributed in the source to Károly Bezdek and extends known special cases, including the plank case; the source does not state a resolution.

Sources & referencesView supporting material

Primary source

Arseniy Akopyan, Roman Karasev and Fedor Petrov, “Bang's problem and symplectic invariants”, arXiv:1404.0871 (2019).

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