(Q1) For mxn, how many pivot elements 0:02:49
(Q2) Column spaces of given matrices 0:37:10
(Q3) Find null space of given matrices 0:47:18
(Q4) REF of a matrix A 1:15:15
(Q5) Given the rank, find the dim of 4 fundamental subspaces 1:15:36
"(Q6) T/F: A & A^T have same number of pivots;
N(A) = N(A^T)" 1:21:24
(Q7) rank of checkerboard 1:28:25
(Q8) Can a vector be expressed as a linear comb of cols of a mat? 1:32:33
(Q9) length of the stick's shadow 1:43:02
(Q10) check for orthogonal or orthonormal 2:04:29
(Q11) make proj mat, use it to find P(b), length of error vector 2:14:56
