Find a basis for the column space of A=(102121531132)A = \begin{pmatrix} 1 & 0 & 2 & 1 \\ 2 & 1 & 5 & 3 \\ 1 & 1 & 3 & 2 \end{pmatrix}A=121011253132
{(1,2,1)T,(0,1,1)T,(2,5,3)T}\{(1, 2, 1)^T, (0, 1, 1)^T, (2, 5, 3)^T\}{(1,2,1)T,(0,1,1)T,(2,5,3)T}
{(1,2,1)T,(0,1,1)T}\{(1, 2, 1)^T, (0, 1, 1)^T\}{(1,2,1)T,(0,1,1)T}
First three columns of AAA
All four columns of AAA