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# Symmetric matrices watch

1. How to show that: , where is symmetric matrix?

Example:

When then

So is the column vector (i-th column).
2. If is symmetric then and is an matrix.

From the definition of matrix multiplication. Do you see how to finish it?
3. Thank you for reply.

So now can I rewrite as: or would it be incorrect?
4. (Original post by Noble.)
If is symmetric then and is an matrix.

From the definition of matrix multiplication. Do you see how to finish it?
I am being a pedant here but you should really write something like

since the inside of the bracket is just a component; not a matrix.
5. (Original post by Mark85)
I am being a pedant here but you should really write something like

since the inside of the bracket is just a component; not a matrix.
Interesting. They don't do this in the lecture notes.
6. (Original post by Noble.)
Interesting. They don't do this in the lecture notes.
Well, you wrote brackets round the which is just the i,jth component of A. It doesn't matter whether you choose to use brackets around a typical component to signify you mean the whole matrix or not but you should at least be consistent.

I mean, sure it is very clear what is meant but such things might cause a problem for people learning e.g. the OP.

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