訂正日: 2006/09/26訂正理由: -訂正箇所: 引用文献情報訂正内容: Right : [1] S. Kobayashi and K. Nomizu, Foundations of differential geometry, Interscience Tract No. 5, 1963. [2] K. Yano, On a structure defined by a tensor field f of type (1,1) satisfying f3+f=0, Tensor, 14 (1963), 9-19. [3] K. Yano, Differential geometry on complex and almost complex spaces, Pergamon Press, 1965. [4] K. Yano and E. M. Patterson, Vertical and complete lifts from a manifold to its cotangent bundle, J. Math. Soc. Japan, 19 (1967), 91-113.