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] F. Hirzebruch, On the characteristic cohomology classes of differentiable manifolds, Colloque Henri Poincaré, Institute Henri Poincaré, (1954). [2] F. Hirzebruch, Neue topologische Methoden in der algebraischen Geometrie, Ergebnisse der Mathematik, (1956). [3] J. Milnor, On manifolds homeomorphic to the 7-sphere, Ann. of Math., 64 (1956), pp. 399-405. [4] N. Shimada, Differentiable structures on the 15-sphere and Pontrjagin classes of certain manifolds, Nagoya Math. J., 12 (1957), pp. 59-69. [5] I. Tamura, On Pontrjagin classes and homotopy types of manifolds, J. Math. Soc. Japan, 9 (1957), pp. 250-262. [6] H. Toda, Y. Saito and I. Yokota, Note on the generator of π7(SO(n)), Mem. Coll. Sci. Univ. Kyôto, 30 (1957), pp. 227-230.