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] S. Ishihara and M. Obata, On the group of conformal transformations of a Riemannian manifold, Proc., Japan Acad., 31 (1955), pp. 426-429. [2] D. Montgomery and H. Samelson, Transformation groups of spheres, Ann. of Math., 44 (1943), pp. 454-470. [3] S. Sasaki, Geometry of the conformal connexion, Sci. Rep. Tôhoku Imp. Univ., Ser. 1, 29 (1940), pp. 219-267. [4] A. H. Taub, A characterization of conformally flat spaces, Bull. Amer. Math. Soc., 55 (1949), pp. 85-89. [5] K. Yano, Sur la théorie des espaces à connexion conforme, Jour. Fac. Sci. Imp. Univ. of Tokyo, Sect. 1, 4 (1939), pp. 1-59. [6] K. Yano, Groups of transformations in generalized spaces, Tokyo, 1949.