Fano manifolds obtained by blowing up along curves with maximal Picard number

Details Fano manifolds obtained by blowing up along curves with maximal Picard number Fano manifolds obtained by blowing up along curves with maximal Picard number

2009-04-15

arxiv.org/abs/0904.2268v1

Mathematics

Algebraic Geometry

8 pages

Scientific paper

The Picard number of a Fano manifold X obtained by blowing up a curve in a smooth projective variety is known to be at most 5, in any dimension greater than or equal to 4. We show that the Picard number attains to the maximal if and only if X is the blow-up of the projective space whose center consists of two points, the strict transform of the line joining them and a linear subspace or a quadric of codimension 2. This result is obtained as a consequence of a classification of special types of Fano manifolds.

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