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arXiv 0705.4481math.AG
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一般投影超曲面的奇性

Singularities of generic projection hypersurfaces

Davis C. Doherty

摘要:

线性投影光滑射影簇提供了一种获得关于原簇的双有理超曲面的方法。我们证明了在低维情况下,所得到的超曲面只有杜波依斯奇点。此外,我们得出结论,这些杜波依斯奇点实际上是半对数正则。然而,我们证明了存在的反例在高维-一般的线性投影的某些品种的尺寸30或更高的既不是半对数正则也杜波依斯。

英文摘要:

Linearly projecting smooth projective varieties provides a method of obtaining hypersurfaces birational to the original varieties. We show that in low dimension, the resulting hypersurfaces only have Du Bois singularities. Moreover, we conclude that these Du Bois singularities are in fact semi log canonical. However, we demonstrate the existence of counterexamples in high dimension -- the generic linear projection of certain varieties of dimension 30 or higher is neither semi log canonical nor Du Bois.

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