訂正日: 2006/10/20訂正理由: -訂正箇所: 引用文献情報訂正内容: Wrong : 1) P. M. Cohn, Free rings and their relations, Academic Press, 1971. 2) N. Jacobson, Generation of separable and central simple algebras, J. Math. Pures Appl., (9), 36 (1957), 217-227. 3) F. Kasch, Projective Frobenius-Erweiterungen, Sitzungsber Heidelberger Akad., 89-109 (1960/1961). 4) Y. Miyashita, On Galois extensions and crossed products, J. Fac. Sci. Hokkaido Univ., Ser. I, 21 (1970), 97-121. 5) Y. Miyashita, Commutative Frobenius algebras generated by a single element, J. Fac. Sci. Hokkaido Univ., Ser. I, 21 (1971), 166-176.
Right : [1] P. M. Cohn, Free rings and their relations, Academic Press, 1971. [2] N. Jacobson, Generation of separable and central simple algebras, J. Math. Pures Appl., (9), 36 (1957), 217-227. [3] F. Kasch, Projective Frobenius-Erweiterungen, Sitzungsber Heidelberger Akad., 89-109 (1960/1961). [4] Y. Miyashita, On Galois extensions and crossed products, J. Fac. Sci. Hokkaido Univ., Ser. I, 21 (1970), 97-121. [5] Y. Miyashita, Commutative Frobenius algebras generated by a single element, J. Fac. Sci. Hokkaido Univ., Ser. I, 21 (1971), 166-176.