Severi, Scorza varieties and Jordan algebras

Details Severi, Scorza varieties and Jordan algebras Severi, Scorza varieties and Jordan algebras

2002-08-27

arxiv.org/abs/math/0208207v1

Mathematics

Algebraic Geometry

14 pages

Scientific paper

The Severi and Scorza varieties are the limiting cases of a theorem of Zak conjectured by Hartshorne. Zak also classified the Severi and Scorza varieties. Surprisingly enough, there are only 4 Severi varieties, one for each dimension 2,4,8 and 16 and they are homogeneous and very strongly linked with the 4 rank-3 Jordan algebras. In this article, I give several variations of Zak's classification theorem, proving a priori the homogeneity of Scorza varieties, and showing how it is possible to give a Jordan structure to the ambient space of a Scorza variety.

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