Introduction to Linear Algebra Lecture 1
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0. 提纲
- n linear equations, n unknuwns (n个未知数的n个线性方程组)
- Row Picture(行图像)
- (重要) Column Picture(列图像)
- Matrix form(矩阵形式)
1.
方程组:2x - y = 0-x + 2y = 3 矩阵:2 -1 x = 0-1 2 y 3A X = bRow picture:做出满足方程的所有的点(把方程表示的直线画出来)直线的交点就是方程组的解。
Column Picturex 2 + y -1 = 0 -1 2 3 linear combination of columns 列的线性组合
所有的线性组合是什么?
3个未知数 3个方程2x - y = 0-x + 2y - z = -1 -3y + 4z = 4矩阵:A = 2 -1 0-1 2 -10 -3 4b = 0-14Row picture:需要画x,y,z立体坐标系了
Column picturex 2 + y -1 + z 0 = 0 -1 2 -1 -1 0 -3 3 4x = 0, y = 0, z = 1
Ax = b 对每个b都有解吗
列的线性组合能否覆盖整个三维空间?
Do the linear combinations of the columns can fill the 3-D?
0 0
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