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Two families of affine projectively flat surfaces

โœ Scribed by Wlodzimierz Jelonek


Publisher
Springer
Year
1997
Tongue
English
Weight
226 KB
Volume
58
Category
Article
ISSN
0047-2468

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Let X โŠ‚ P N be a closed irreducible n-dimensional subvariety. The kth higher secant variety of X , denoted X k , is the Zariski closure of the union (in P N ) of the linear spaces spanned by k points of X . A simple dimension count shows that dim X k 6 k(n + 1) -1, and that when equality holds, ther