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. Bochner: Vector fields and Ricci curvature. Bull. Amer. Math. Soc., 52 (1946), 776-797. [2] S. Bochner: Vector fields on complex and real manifolds. Ann. of Math., 52 (1950), 642-649. [3] K. Yano: On harmonic and Killing vector fields. Ann. of Math., 55 (1952), 38-45.
