a=matrix([[-6,-1],[2,-3]])
i=matrix(2,2)+1
y=-7
b=a+y*i
c=a.eigenvalues()
d=b.eigenvalues()
e=[0,0]
e[0]=-c[0]+d[0];
e[1]=-c[1]+d[1];
bool(e[0]==y and e[1]==y)

Strang-5.1.3-U (last edited 2010-12-18 07:17:10 by YASHWANTH)