【摘 要】
:
For an affine variety X,an LND of k[X] corresponds to a oneparameter subgroup of automorphisms.We generate a subgroup SAut(X)of Aut(X)by all such automorphi
【机 构】
:
Laboratory of Algebraic Geometry and Applications,Russia
【出 处】
:
International Short-School/Conference on Affine Algebraic Ge
论文部分内容阅读
For an affine variety X,an LND of k[X] corresponds to a oneparameter subgroup of automorphisms.We generate a subgroup SAut(X)of Aut(X)by all such automorphisms and study its action on X.Our main interest is to describe X such that the action of SAut(X)is infinitely transitive(in other words,can map any m regular points to any other m regular points).We give some examples of such varieties.They are all unirational.Conversely,for a unirational variety Y of dimension n with an additional data of n P1-bundles,we construct a suitable birational model of some stabilization of Y,obtaining an affine infinitely transitive variety.
其他文献
Empathy,a basic social cognitive function,plays a vital role in everyones daily life.Two kinds of stimulus materials(painful facial expressions and body par
脱落酸(abscisic acid, ABA)是一种重要的植物激素,不仅在植物的生长发育中而且还在植物对各种环境胁迫反应中起重要作用。已有研究表明ABA的作用模式与植物细胞中氧化胁迫有关,ABA能够诱导NADPH氧化酶引起活性氧产生及抗氧化基因的表达,从而提高植物抗氧化防护能力。Ca2+/CaM依赖性蛋白激酶(CBK)是一种Ser/Thr类蛋白激酶,在动物中,Ca2+/CaM依赖性蛋白激酶(CaM
区域是GIS的基本单元之一,对于区域的分析在GIS分析中占有相当大的比重。但是这类实体在抽象描述为GIS的空间目标时难以避免地会带有一定程度的不确定性,这种不确定性指的是在
我国正在大力发展北斗卫星导航系统(BDS),现已初步形成亚太地区的导航定位能力。对于导航系统来说,高精度的导航定位依赖于高精度的时间测量。BDS卫星搭载的是国产Rb原子钟,由于
本文通过对变形监测特点的分析,主要研究了小波分析方法、灰色系统理论和地理信息系统在变形监测中的应用。 由于变形监测数据量大、种类繁多、内容复杂,为充分利用地理信息
论述了矿山地理信息系统的研究现状以及其应用于开采沉陷学的必要性和意义。分析了开采沉陷预计的原理,最后选用概率积分法,利用面向对象的高级编程语言,实现了基于MGIS矿山开采
众所周知,我国是世界上兴建大坝最多的国家,建国以来,共修建约8.6万座堤坝。这些工程在国民经济中发挥了重大的作用。大坝安全监测、分析与预报是大坝安全管理中涉及多学科交叉
We give a survey of some recent results about the degeneration of families of polynomial automorphisms in three situations.A)In dimension 2 and length 2,whe
The group of automorphisms of the complex affine plane has a well known structure as an amalgamated free product of the triangular and affine subgroups.As s