矩阵代数 Matrix Algebra(持续更新)

要点

  1. 说一个矩阵的是m by n,是有m行,n列的元素。第i行,第j列的元素A,记为aij。
  2. 两个矩阵的相乘,不具备数字间乘除的关系,AB不等于BA。It cannot be commute.
  3. 矩阵要想相乘,必须满足,左侧矩阵的列数等于右侧矩阵的行数。

Associative Law for Matrix Multiplication矩阵相乘的结合律

即,

A(BC)=(AB)CA(BC)=(AB)C.

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