On Birational Geometry of Algebraic Varieties

Sakai把Zarishi关于射影平面的循环覆盖的定理推广到代数曲面的循环覆盖上，假设覆盖的次数是素数的幂，并且分支是可约的. Okumura得到了复射影算子的CR-子群是奇数维球面的积的一个充分条件，Takeuchi对模群SL_2（TS）中具有符号（o ; e_1，e_2，e_3）的所有模子群G进行了分类。此外，他还给出了矩阵的形式。小池考虑了贝尔方程的解。Egashira研究了紧致流形上的C^2-类codime-one叶理化。

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.