Hi all!
I would like to ask - is there possibility in Sage ( or Maxima) to
solve first order recurrence relation given by linear system with
several variables?
For example:

a(n+1) = A*a(n) + B*b(n)
b(n) = C*a(n) + D*b(n)

Have I find solution of linear system at first an then solve
"separated" relation or is there a possibility to solve such system
directly? As far as I know - rsolve  from sympy -  takes only one
relation as argument.

Actually I have such system with 4-variables and rational - constant
-  coefficients ...
Thanks!
Kazek Kurz

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