摘要: https://www.zhihu.com/question/324646020 https://math.stackexchange.com/questions/500212/show-that-ideal-is-a-subring 子群,子环是一种子结构 正规子群和理想是一种等价类,可以诱导出商 阅读全文
posted @ 2020-05-12 11:30 stone-stone 阅读(1569) 评论(0) 推荐(0) 编辑