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Web skærmformat. - Aarhus Universitet

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V. Matricer – 2. Lineære afbildninger 393<br />

For enhedsmatricen er<br />

In k = In<br />

2.15. Pas på matrix potens ☞ [LA] 2 Matricer<br />

Bemærkning<br />

Potensregneregler gælder<br />

A l A m = A l+m<br />

Men normalt er<br />

For eksempel<br />

(A l ) m = A lm<br />

A m B m = (AB) m<br />

A 2 B 2 = (AA)(BB) = (AB)(AB) = (AB) 2<br />

2.16. Potens af diagonalmatrix<br />

Eksempel<br />

☞ [LA] 2 Matricer<br />

For en diagonal n × n-matrix<br />

⎛ ⎞<br />

Λ =<br />

λ1 0 ...<br />

.<br />

0 ..<br />

⎟<br />

0 ⎟<br />

⎠<br />

. 0 λn<br />

⎜<br />

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