摘要：
Linear independence Spanning a space Basis and dimension 以上概念都是针对a bunch of vectors, 不是矩阵里的概念 Suppose A is m by n with m<n, then there are non-zero so 阅读全文
摘要：
Compute solution of AX=b (X=Xp+Xn) rank r r=m solutions exist r=n solutions unique example: 若想方程有解，b1,b2,b3需要满足什么条件？ 观察矩阵可知，第三行是前两行的和，所以b1+b2=b3 Solva 阅读全文