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arXiv math/9805118math.AG
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环面簇的拟投射约化

Quasi--Projective Reduction of Toric Varieties

A. A'Campo-Neuen, J. Hausen

摘要:

定义复代数簇$X$的拟投射约化为从$X$到拟投射簇的正则映射,该映射关于从$X$到拟射影簇的正则映射是泛映射.环面拟投射约化是环面簇范畴中的类似概念。对于给定的复曲面簇$X$,我们首先构造一个复曲面拟投射约化。然后证明了$X$有拟投射约化当且仅当它的环面拟投射约化是满射的。我们应用这个结果来刻画当一个子环面作用在一个拟投射环面簇上时,它在拟射影簇范畴中容许一个范畴商。

英文摘要:

We define a quasi--projective reduction of a complex algebraic variety $X$ to be a regular map from $X$ to a quasi--projective variety that is universal with respect to regular maps from $X$ to quasi--projective varieties. A toric quasi--projective reduction is the analogous notion in the category of toric varieties. For a given toric variety $X$ we first construct a toric quasi--projective reduction. Then we show that $X$ has a quasi--projective reduction if and only if its toric quasi--projective reduction is surjective. We apply this result to characterize when the action of a subtorus on a quasi--projective toric variety admits a categorical quotient in the category of quasi--projective varieties.

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