訂正日: 2006/08/29訂正理由: -訂正箇所: 引用文献情報訂正内容: Right : 1) Journal of the Mathematical Society of Japan Vol. 1, No. 3, 1949. This note will be denoted by [K], and we shall use the same terminologies and notations as in [K]. 2) It is not necessary for this theorem for U to have a complete model without singularities, which is birationally equivalent to U over k. From the theory of normal variaties we may easily deduce that the theorem holds true if k in perfect.