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1ST DIFFERENCE Das Hauptgebiet der Matrizenrechnung the central field of matrix algebra discipline des matrices, analyse matricielle parte principal del álgebra matricial matrice (calcolo matriciale) Differenzen-Matrix/difference-matrix (forward differencing)/matrice difference/ matriz en diferencias/matrice differenziale y' =(y1 y2 ... yT), y∈RT, zt := yt - yt-1 (t=2,3,...,T), z' =(z2 z3 ... zT), z∈RT-1 RT→RT-1 : z=Dy, D∈RT-1,T -1 1 0 0 ... 0 0 0 -1 1 0 ... 0 0 0 0 -1 1 ... 0 0 D:= 0 0 0 0 ... 0 0 0 0 0 0 ... 1 0 0 0 0 0 ... -1 1 (MATRICES, DIFFERENCE)