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) In this note we shall stick throughout, in terminologies and notations, to Weil, 1. c. 2) As in Weil, 1. c. we distinguish abstract varieties by the use of capitals, and also by the use of bold face capitals to denote them. Similarly for related notions, as points, subvarieties, etc. 3) This result has been obtained also by Van der Waerden, as was communicated to the writer by K. Kodaira.