These are 18 . 100b ( analysis and metric spaces ) and 18 . 700 ( linear algebra ) . the course 18 . 101 ( calculus in several variables ) would be useful and some familiarity with topological groups is also helpful 学生需要预修18 . 100b (分析和度量空间)和18 . 700 (线性代数) 。预修过课程18 . 101 (多变数微积分)或者熟悉拓扑群都对学习本课程有帮助。