指出某线性代数教材中一道例题的解法存在疏漏之处,分析了其中不够严谨的地方,举例予以说明,并补充完善了原解法,介绍了推广后的相关定理.
Point out the omission of the solution of an example in one linear algebra textbook, analyse why it is not strict enough, give an examle to explain, improve the original solution, introduce the relevant theorem.