Sur une conjecture de Mukai

Details Sur une conjecture de Mukai Sur une conjecture de Mukai

2002-04-25

arxiv.org/abs/math/0204314v1

Mathematics

Algebraic Geometry

21 pages, in french

Scientific paper

Generalizing a question of Mukai, we conjecture that a Fano manifold $X$ with Picard number $\rho_X$ and pseudo-index $\iota_X$ satisfies $\rho_X (\iota_X-1) \le \dim(X)$. We prove this inequality in several situations: $X$ is a Fano manifold of dimension $\le 4$, $X$ is a toric Fano manifold of dimension $\le 7$ or $X$ is a toric Fano manifold of arbitrary dimension with $\iota_X \ge \dim(X)/3+1$. Finally, we offer a new approach to the general case.

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