【摘 要】
:
Let Crn(k) be the Cremona group in n variables and let G (
【出 处】
:
2012年本质维数和克里摩拿群国际学术研讨会
论文部分内容阅读
Let Crn(k) be the Cremona group in n variables and let G (<) Crn(k) be a group of order two.We may assume that G acts biregularly on a smooth projective variety X so that the embedding G (<) Crn(k) is induced by the action of G on the function field k(X).Suppose that there exists a non-uniruled component S of the G-fixed point locus.It is easy to see that there exists at most one such a component and the birational type of S does not depend on the choice of our smooth model X.
其他文献
(1)对于中老年人来说,刚吃完饭就走动无益健康,特别是对于患有冠心痛的老年人来说,餐后胃部膨胀可反射性引起冠状动脉收缩,引起心肌供血减少。因此,中老年人餐后应适当休息,以改善心肌供血功能。 (2)如果饭后立即饮茶,茶水会冲淡胃液,影响胃内食物的正常消化,甚至有可能患贫血症,因此应待1小时后胃内食物消化得差不多时再饮用茶水。 (3)如果您在饭后立即吃水果,容易造成其在胃内滞留,不能正常消化。
This talk is based on our joint work with V.Kiritchenko and V.Timorin [?].We describe a new approach to Schubert calculus on a full flag manifold using the
友谊,一般来说,多存在于同代人之间。最常见的,当属从小学直到大学的同班同学。许多一直保持联系的同窗之谊,常能维系终生。 然而,有一种友谊,则存在于年龄相差很多的人之间
制备液体菌种,周期短、产量高、菌龄整齐、成本低廉,是食用菌工厂化生产的新途径。1986年9月,我们开始培养黑木耳(Auricularia auricula)液体菌种,并进行了转接段木栽培试验
In this talk we introduce new Hodge theoretic structures and derive invariants.Examples and applications will be discussed.
本刊讯(记者史新建通讯员朱立奎刘恕)2020年河南省工考中心在省人力资源和社会保障厅党组的正确领导下,积极统筹新冠肺炎疫情防控和工考业务工作,以“健康、安全、公平”为目
Studying conjugacy classes of finite subgroups in Cremona groups naturally leads to questions involving equivariant birational rigidity of rational Mori fib
请下载后查看,本文暂不支持在线获取查看简介。
Please download to view, this article does not support online access to view profile.
Mirror symmetry,from variations of Hodge structures point of view,relates Fano varieties and particular Laurent polynomials - toric Landau–Ginzburg models.
兰州籽瓜(Convar megalaspermus Lin et Chao)是兰州的特产。籽瓜也叫打瓜。是西瓜的一个变种。根据皋兰县志(1774年)记载“西瓜种类甚多。皮有青、白、绿、黑数色。子有黑