Perfect lattice
In mathematics, a perfect lattice (or perfect form) is a lattice in a positive definite real vector space, that is determined by the set S its minimal vectors in the sense that there is only one positive definite quadratic form taking value 1 at all points of S. A strongly perfect lattice is one whose minimal vectors form a spherical 4-design. Perfect lattices were introduced by Korkine & Zolotareff (1877).
() proved that a lattice is extreme if and only if it is both perfect and eutactic.
The number of perfect lattices in dimensions 1, 2, 3, 4, 5, 6, 7, 8 is given by 1, 1, 1, 2, 3, 7, 33, 10916 (sequence A004026 in OEIS). Conway & Sloane (1988) summarize the properties of perfect lattices of dimension up to 7. Sikirić, Schürmann & Vallentin (2007) verified that the list of 10916 perfect lattices in dimension 8 found by Martinet and others is complete.
References
- Conway, John Horton; Sloane, N. J. A. (1988), "Low-dimensional lattices. III. Perfect forms", Proceedings of the Royal Society. London. Series A. Mathematical, Physical and Engineering Sciences 418 (1854): 43–80, ISSN 0962-8444, JSTOR 2398316, MR953277
- Korkine; Zolotareff (1877), "Sur les formes quadratique positives", Mathematische Annalen 11: 242–292, doi:10.1007/BF01442667, ISSN 0025-5831
- Martinet, Jacques (2003), Perfect lattices in Euclidean spaces, Grundlehren der Mathematischen Wissenschaften [Fundamental Principles of Mathematical Sciences], 327, Berlin, New York: Springer-Verlag, ISBN 978-3-540-44236-3, MR1957723, http://books.google.com/books?id=gd9CcFclBRIC
- Sikirić, Mathieu Dutour; Schürmann, Achill; Vallentin, Frank (2007), "Classification of eight-dimensional perfect forms", Electronic Research Announcements of the American Mathematical Society 13: 21–32, arXiv:math/0609388, doi:10.1090/S1079-6762-07-00171-0, ISSN 1079-6762, MR2300003
- Voronoi, G. (1908), "Nouvelles applications des paramètres continus à la théorie des formes quadratiques. Premier Mémoire: Sur quelques propriétés des formes quadratiques positives parfaites" (in French), Journal für die reine und angewandte Mathematik 133: 97–178, doi:10.1515/crll.1908.133.97, ISSN 0075-4102, http://resolver.sub.uni-goettingen.de/purl?GDZPPN002166534
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