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Chebyshevskii Sbornik, 2018, Volume 19, Issue 2, Pages 407–420
DOI: https://doi.org/10.22405/2226-8383-2018-19-2-407-420
(Mi cheb663)
 

An analog of Ordin's theorem for parallelotopes

V. P. Grishukhin

Central economic and mathematical Institute of RAS
References:
Abstract: Parallelotope is a convex polytope in an affine space such that its shifts by vectors of a lattice $L$ fill the space without gaps and intersections by inner points. A special case of a parallelotope is a Dirichlet-Voronoi cell of a lattice with respect to a metric generated by a positive quadratic form. More than 100 years ago G. Voronoi supposed that each parallelotope is a Dirichlet-Voronoi cell of its lattice with respect some metric.
A.Ordin introduced notions of an irreducible face and a $k$-irreducible parallelotope whose all faces of codimension $K$ are irreducible. A parallelotope tiling is called $k$-irreducible if its parallelotopes are $k$-irreducible. Ordin proved the conjecture of Voronoi for $3$-irreducible parallelotopes.
There are two vectors related to a facet $F$ of a parallelotope. Namely, facet vector $l_F$ of the lattice $L$ of the tiling $\mathcal T$ and normal vector $p_F$ of the facet $F$. The facet vectors integrally generate the lattice $L$. One of the form of Voronoi conjecture asserts that there are such parameters $s(F)$ that scaled (canonical) normal vectors $s(F)p_F$ integrally generate a lattice $\Lambda$. In this paper, uniquely scaled faces are defined. Such a face $G$ determines uniquely up to a multiple parameters $s(F)$ of facets of the tiling $\mathcal T$ containing the face $G$. A tiling whose faces of codimension $k$ are uniquely scaled is $k$-irreducible.
It is proved here the following analog of Ordin's Theorem: There exists a canonical scaling of normal vectors of facets of the tiling $\mathcal T$ if, for some integer $k\ge 1$, all its faces of codimension $k$ and $k+1$ are uniquely scaled. The cases $k=2$ and $k=3$ correspond to $2$- and $3$-irreducible tilings of Ordin.
Keywords: parallelotope, Voronoi conjecture, uniquely scaled normal vectors.
Received: 16.06.2018
Accepted: 17.08.2018
Bibliographic databases:
Document Type: Article
UDC: 511.9
Language: Russian
Citation: V. P. Grishukhin, “An analog of Ordin's theorem for parallelotopes”, Chebyshevskii Sb., 19:2 (2018), 407–420
Citation in format AMSBIB
\Bibitem{Gri18}
\by V.~P.~Grishukhin
\paper An analog of Ordin's theorem for parallelotopes
\jour Chebyshevskii Sb.
\yr 2018
\vol 19
\issue 2
\pages 407--420
\mathnet{http://mi.mathnet.ru/cheb663}
\crossref{https://doi.org/10.22405/2226-8383-2018-19-2-407-420}
\elib{https://elibrary.ru/item.asp?id=37112163}
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