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arXiv math/0405194math.AG
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具有孤立奇点的双空间

Double spaces with isolated singularities

Ivan Cheltsov

摘要:

证明了在具有孤立奇点的次$2n$超曲面$F\subset\mathbb{P}^{n}$上的$\mathbb{P}^{n}$分支的双覆盖的非理性性,使得$n\ge 4$和超曲面$F$的每个奇点是普通的,即其切锥的投影是光滑的,其重数不超过$2(n-2)$ .

英文摘要:

We prove the non-rationality of a double cover of $\mathbb{P}^{n}$ branched over a hypersurface $F\subset\mathbb{P}^{n}$ of degree $2n$ having isolated singularities such that $n\ge 4$ and every singular points of the hypersurface $F$ is ordinary, i.e. the projectivization of its tangent cone is smooth, whose multiplicity does not exceed $2(n-2)$.

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