Arthur Cayley 被公认为矩阵论的奠基人。他开始将矩阵作为独立的数学对象研究时,许多与矩阵有关的性质已经在行列式的研究中被发现了,这也使得凯莱认为矩阵的引进是十分自然的。他说:“我决然不是通过四元数而获得矩阵概念的;它或是直接从行列式的概念而来,或是作为一个表达线性方程组的方便方法而来的。”他从1858年开始,发表了《A memoir on the theory of matrices》等一系列关于矩阵的专门论文,研究了矩阵的运算律、矩阵的逆以及转置和特征多项式方程
为什么叫线性代数?
Where does this word "linear" come from?
Why does this have anything to do with lines?
Well, this isn't the etymology, but one way I like to think about it is that if you fix one of those scalars, and let the other one change its value freely, the tip of the resulting vector draws a straight line.![]()
线性代数的基础介绍
这五个视频看的我泪如雨下(from 3Blue1Brown):
https://www.youtube.com/watch?v=fNk_zzaMoSs
https://www.youtube.com/watch?v=k7RM-ot2NWY
https://www.youtube.com/watch?v=kYB8IZa5AuE
https://www.youtube.com/watch?v=XkY2DOUCWMU
https://www.youtube.com/watch?v=Ip3X9LOh2dk
矩阵的介绍和加减乘运算(from 可汗学院):
https://www.youtube.com/watch?v=xyAuNHPsq-g
https://www.youtube.com/watch?v=aKhhYguY0DQ
https://www.youtube.com/watch?v=OAh573i_qn8
矩阵乘法
- 只有横向和纵向数量对称才可以相乘,否则不能相乘
- 某个位置的结果为第一个矩阵的行数,第二个矩阵的列数,的乘积的和
- 矩阵乘法不适用交换律











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