On Birational Geometry of Algebraic Varieties

论代数簇的双有理几何

• 批准号: 07454003
• 负责人: SAKAI Fumio
• 金额: $ 4.16万
• 依托单位: Saitama University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1995
• 资助国家: 日本
• 起止时间: 1995 至 1996
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07454003/
• 关键词: cyclic covering; Betti number; algebraic surface; singularities; projective space; modular group; monifold; foliation; Bellman方程式; 4元数; 量子束; 概接触構造

Sakai generalizel Zarishi's theorem on cyolic coverings of the projective plane to the cyclic coveings of algebraic surfaces under the hyposhesis that the degree of the covering's a power of a prime number and the Branch euwe could be reducible. He also improve an estimate of the total Milnor member of plane cuwes with simple singulinties.Okumura obtained a sufficient condition which guaranties that a CR-submeniforld of a complex projective opere is a product of odd dimensional sphers.Takeuchi classified all moduler subgroups G of the modular group SL_2 (TS) which has signatine (o ; e_1, e_2, e_3). Moreour, he gave the matrix forms.Koike considored the solution of a Bell monequotion. He obtoineda sufficient condition for the uniqueness of the solution.Egashira studied C^2-class codimeusion one foliatiation on a compact monifold.

Sakai Generalizel Zarishi的定理在投影平面的圆环覆盖物上，在代数表面的循环构中，这是在覆盖范围的质量质量和分支EUWE的覆盖率的差异下，可以还原。他还用简单的singulinties进行了对飞机库维斯的总成员的估计。okumura获得了足够的条件，可以保证，复杂的射击opere的cr-subeniforld是奇数尺寸sphers.takeuchi的乘积。takeuchitakeuchi sl_2 sl_2 e_3（e_3 e_2 e_2 s e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e; Moreour，他给出了矩阵形式。Koike认为铃铛的解决方案。他为溶液的独特性提供了足够的条件。Egashira在紧凑的monifold上研究了C^2级代数。

项目成果

S. Egashira: "Expansion groth of smooth codimension-one foliations" J. Math. Soc. Japan. 48. 109-123 (1996)

S. Egashira：“光滑余维一叶状结构的膨胀增长”J. Math。

Sakai, F.: "Generaligation of Zariski's theorem on the inegularity of cyclic coverings" Proc.Conference (T.I.T). 99-102 (1996)

Sakai, F.：“Zariski 循环覆盖不规则性定理的概括”Proc.Conference (T.I.T)。

Sakai, F.: "The inegulenty of cyclic coverings and singularities of plane cuwes" Proc.Conference (Saitama Univ.). 118-132 (1996)

Sakai, F.：“平面立方体的循环覆盖和奇点的不恰当性”Proc.Conference（埼玉大学）。

K.Takeuchi: "Subgroups of the modulargroups with signeture(o;e_1,e_2,e_3)" Saitoma Math,J.14. 55-78 (1996)

K.Takeuchi：“带有签名的模群的子群(o;e_1,e_2,e_3)”Saitoma Math，J.14。

T. Sakurai: "Analytic hypoellipticity and local solvability for a class of pseudo-differential operators with symplectic characteristics" Banach Center Publications. (1995)

T. Sakurai：“一类具有辛特征的伪微分算子的解析亚椭圆性和局部可解性”Banach Center Publications。