个人推荐：这是每个理科生都需要了解的线性代数基础课程，同时也是多所外国高校所推荐的线性代数的教科书。由于这些外国书籍都很贵，有心的读书人，要是能够在这里下载，何乐而不为？本书经许多教研人员翻译成中文，但是如果能读到原汁原味的英文教材，不是更好的体验吗？

Linear algebra is relatively easy for students during the early stages of the course, when the material is presented in a familiar, concrete setting. But when abstract concepts are introduced, students often hit a brick wall. Instructors seem to agree that certain concepts (such as linear independence, spanning, subspace, vector space, and linear transformations), are not easily understood, and require time to assimilate. Since they are fundamental to the study of linear algebra, students' understanding of these concepts is vital to their mastery of the subject. Lay introduces these concepts early in a familiar, concrete Rn setting, develops them gradually, and returns to them again and again throughout the text so that when discussed in the abstract, these concepts are more accessible.