Either my brain is seriously fried up right now or the computer is wrong.
If I have a matrix $\begin{bmatrix} 4 & -2\\ 2 & -1 \\ 0 & 0 \end{bmatrix}$ multiply by its transpose $\begin{bmatrix} 4 &2 &0 \\ -2&-1 &0 \end{bmatrix}$, I should get a $3 \times 3$ $\begin{bmatrix} 20 &10 &0 \\ 10 &5 &0 \\ 0&0 &0 \end{bmatrix}$
For some reason Maple is giving me a $2 \times 2$ $\begin{bmatrix} 20 &10 \\ 10 &5 \\ \end{bmatrix}$
Why did they delete the last row and column of 0s? You can't do that