Thread: [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?

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

Thanks, I though that was the case.

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

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"?

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