U=matrix([[4,4,8,8,],[0,1,2,2],[0,0,2,6],[0,0,0,2]])
U.determinant()
A=U.transpose()
A.det()
B=U.inverse()
B.det()
U.swap_rows(0,3)
U.swap_rows(1,2)
U.det()

Strang-4.2-7-U (last edited 2010-12-18 08:18:40 by kenguva.monica)