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Web skærmformat. - Aarhus Universitet

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V. Matricer – 1. Vektorer og matricer 384<br />

⎛<br />

1 0<br />

⎞<br />

0<br />

I3 = ⎝0<br />

1 0⎠<br />

0 0 1<br />

1.32. Multiplikation af identitetsmatrix ☞ [LA] 2 Matricer<br />

Sætning 3<br />

Lad A vœre en m × n-matrix. Så gœlder<br />

ImA = A = AIn<br />

"Matrix multiplikation med identitetsmatricen œndrer ikke en matrix."<br />

Bevis<br />

Den j-te søjle i In er ej, så den j-te søjle i AIn er<br />

den j-te søjle i A.<br />

Aej = a •j

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