1. ## [SOLVED] Elementary Matrix

Just double checking...

Row 3 multiplied by (-1)
is represented by an identity matrix with I33 = -1, correct?

and it's inverse is just the identity matrix?

2. Hello,
Originally Posted by Noxide
Just double checking...

Row 3 multiplied by (-1)
is represented by an identity matrix with I33 = -1, correct?
Yes

and it's inverse is just the identity matrix?
No, its inverse is itself. Just check the multiplication

3. Thanks, I though that was the case.

I know that P32's inverse is P32, but should I even bother writing the -1 superscript?

4. Originally Posted by Noxide
Thanks, I though that was the case.

I know that P32's inverse is P32, but should I even bother writing the -1 superscript?
You realize, don't you, that no one has any idea what you mean by "P32"?

5. Oh, I thought it was a convention that Pxy was a permutation matrix.