a=1 b=1 a=1 b=1 r wij = yib zbj , b=1 17 q q r tij = xia waj = xia ( yab zbj ). (1.26) a=1 a=1 b=1 V~orreldes valemeid (1.25) ja (1.26), saame vij = tij , i Np , j Ns = (XY )Z = X(Y Z). 2 Maatriksite X = (xij ), kus i Nm , j Nn , ja n-j¨arku u ¨hikmaatriksi E1 = (ij ) korrutise XE1 = (yij ) u
a=1 b=1 a=1 b=1 r wij = yib zbj , b=1 17 q q r tij = xia waj = xia ( yab zbj ). (1.26) a=1 a=1 b=1 V˜orreldes valemeid (1.25) ja (1.26), saame vij = tij , ∀ i ∈ Np , ∀ j ∈ Ns =⇒ (XY )Z = X(Y Z). ♠ 2◦ Maatriksite X = (xij ), kus i ∈ Nm , j ∈ Nn , ja n-j¨arku u ¨hikmaatriksi
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