# matrix vectors

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• April 16th 2008, 04:22 AM
00hyvs45
matrix vectors
Please help!!
• April 16th 2008, 05:26 AM
Isomorphism
Quote:

Originally Posted by 00hyvs45
Please help!!

1) First multiply the matrix out and get the conditions a+2b-c = 0. Then try to prove both closure under addition and closure under multiplication.

2)Both fail.
i) $\displaystyle A = \left[ \begin{array}{cc} 1 & 0 \\
0 & 1
\end{array} \right]$
and $B = -A$

ii) $\forall A \in S$, $\lambda = 0 \Rightarrow \lambda A = 0 \notin S$