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Simultaneous difference equation
Hello, I have just started using (or more appropriately trying to use) Mathematica. As you expect, I have a problem. I would like to know Mathematica code for solving simultaneous difference eqation; for example: a_11*x(t)+a_12*y(t)=a_13*x(t-1)+a_14*y(t-1)+k_1 a_21* x(t)+a_22*y(t)=a_23*x(t-1)+a_24*y(t-1)+k_2 Or, in matrix notation, A_1*Y(t)=A_2*Y(t-1)+K t denotes time t, and t-1 is one period before time t. I have go through help menu in Mathematica. Yet, I could not get reached to the topic of difference equation. If you know the code (or what to be typed), could you reply this message? Thank you very much in advance.