Dvoretzky-Rogers equality conjecture for the reverse isodiametric problem

Let DR(m,n,j)\operatorname{DR}(m,n,j) denote the Dvoretzky-Rogers-type volume quantity used in the paper. The relevant parameter choice is m=(n+12)m=\binom{n+1}{2}, j=nj=n, in dimension nn.

Dvoretzky-Rogers equality conjecture. For every nNn\in\mathbb{N},

DR((n+12),n,n)=n+1n!2n2.\operatorname{DR}\left(\binom{n+1}{2},n,n\right)=\frac{\sqrt{n+1}}{n!\,2^{\frac n2}}.

This equality would imply the general-case part of Makai Jr.'s reverse isodiametric conjecture. The surrounding results provide lower bounds for the Dvoretzky-Rogers quantity and show that the conjectured value would yield the desired reverse isodiametric bound; whether equality holds remains open.

Sources & referencesView supporting material

Primary source

Bernardo González Merino and Matthias Schymura, “On the reverse isodiametric problem and Dvoretzky-Rogers-type volume bounds”, arXiv:1804.05009 (2020).

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