A=matrix([[2,-1,0],[-1,2,-1],[0,-1,2]])
A11=matrix([[2,-1],[-1,2]])
A11.det()
A12=matrix([[-1,-1],[0,2]])
A12.det()
A13=matrix([[-1,2],[0,-1]])
A13.det()
A21=matrix([[-1,0],[-1,2]])
A21.det()
A22=matrix([[2,0],[0,2]])
A22.det()
A23=matrix([[2,-1],[0,-1]])
A23.det()
A31=matrix([[-1,0],[2,-1]])
A31.det()
A32=matrix([[2,0],[-1,-1]])
A32.det()
A33=matrix([[2,-1],[-1,2]])
A33.det()
#cofactror of A is
C=matrix([[3,-2,1],[1,4,-2],[1,-2,3]])
D=C.transpose()
E=A*D

Strang-4.3-27-U (last edited 2010-12-18 12:08:29 by 10)