论文标题
等效的birational嵌入IV：减少品种
Equivalent birational embedding IV: reduced varieties
论文作者
论文摘要
如果有一张cremona地图绘制另一个图片，则据说有两个减少的投射方案相当于克雷莫纳。在本文中，我修改了有关克雷莫纳等效性的一些已知结果，并将[MP09]的主要结果扩展到减少方案。这允许证明理性次要结合的一般订约性结果。
Two reduced projective schemes are said to be Cremona equivalent if there is a Cremona map that maps one in the other. In this paper I revise some of the known results about Cremona equivalence and extend the main result of [MP09] to reduced schemes. This allows to prove a very general contractibility result for union of rational subvarieties.
