Hi, I have a problem with an argument here. I am given 4 Matrixes, A, C, D and F. see attachment.. I can then see that A^n = C*D^n*F = some matrix with a Fibonacci-serie in it. I can also see that C*F=F*C=I or C is the inverse of F My problem is to relate these two: How can the fact that C is the inverse of F explain that A^n = C*D^n*F ? NB. A^n = C*D^n*F is NOT true for any two C and F, C^-1=F, wich in my mind make it even harder to see the relation.