第72页

第24页

Let me connect these special matrices A and S to calculus. The vector x changes to a fu...

第59页

When E multiplies on the right, it acts on the columns of A. ?

第72页

第85页

To solve A x = b without A-I, we deal with one column b to find one column x. ?

第81页

Suppose there is a nonzero vector x such that Ax = 0