We give,in a more general case than the Noetherian case,an answer to the question posed by Shaul on the flatness of the ......

一个环Ｒ称为左（右）ＺＩＦ环，是指对每一个左（右）Ｒ模Ｍ，Ｍ是内射的当且仅当Ｍ＊是平坦的．Ｒ称为ＺＩＦ环是指它既是左且右的ＺＩＦ环．这里（）＊＝ＨｏｍＺ（－，Ｑ／Ｚ）．本文讨论了ＺＩＦ环的结构以及ＺＩＦ环与其他一......