Thanks a lot!!!

- Sep 4th 2007, 01:30 PMseekorHow to prove: A,B are orthogonal matrices, if det(A)+det(B)=0, then A+B is singular.
Thanks a lot!!!

- Sep 4th 2007, 02:57 PMtopsquark
- Sep 4th 2007, 06:06 PMJakeD
- Sep 5th 2007, 06:43 AMtopsquark