- #1

karush

Gold Member

MHB

- 3,269

- 5

and not associative.

ok I read all I could on trying to understand this but seem to not see something simple

if we have the example of

$u=\begin{bmatrix}2\\-3\\4\\2\end{bmatrix} v=\begin{bmatrix}-1\\5\\2\\-7\end{bmatrix} u+v=\begin{bmatrix}2\\-3\\4\\2\end{bmatrix}+\begin{bmatrix}-1\\5\\2\\-7\end{bmatrix} =\begin{bmatrix}2+(-1)\\-3+5\\4+2\\2+(-7)\end{bmatrix} =\begin{bmatrix}1\\2\\6\\-5\end{bmatrix}$ if we replace the + with - does that mean it is not commutative and not associative. |