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arXiv 1107.0438math.AG
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正交Grassmannian的不可压缩性

Incompressibility of orthogonal grassmannians

Nikita A. Karpenko

摘要:

我们证明了Bryant Mathews(2008)的猜想。设Q是任意域上非退化二次型q的全迷向i-平面的正交格拉斯曼算子(其中i是区间[1,(\dim q)/2]中的整数).如果Q上每个闭点的度都能被2 ^i整除,且q在Q的函数域上的Witt指数等于i,则簇Q是2-不可压缩的。

英文摘要:

We prove the following conjecture due to Bryant Mathews (2008). Let Q be the orthogonal grassmannian of totally isotropic i-planes of a non-degenerate quadratic form q over an arbitrary field (where i is an integer in the interval [1, (\dim q)/2]). If the degree of each closed point on Q is divisible by 2^i and the Witt index of q over the function field of Q is equal to i, then the variety Q is 2-incompressible.

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