# Math Help - rewrite equation

1. ## rewrite equation

Hi,
Is it possible to rewrite

$P_1 H X_1 - P_2 H X_2 = 0$

to something like

$(A - B) H = 0$?

Thanks!

2. Originally Posted by Timmer
Hi,
Is it possible to rewrite

$P_1 H X_1 - P_2 H X_2 = 0$

to something like

$(A - B) H = 0$?

Thanks!

What are P_1, H, X_1? Are these numbers, matrices...what? Is the product commutative or not?

Tonio

3. Thanks for your reply and sorry for the lack of information.

P1 and P2 are m x 4 matrices, X1 and X2 are 4 x n matrices and H is a 4 x 4 matrix. So the product is not commutative.

Tim