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Web skærmformat. - Aarhus Universitet

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V. Matricer – 4. Determinanter<br />

= (−1)<br />

423<br />

3+3<br />

<br />

<br />

1<br />

0 = 1<br />

<br />

0<br />

<br />

1<br />

4.8. Trekantsmatrix ☞ [LA] 8 Determinanter<br />

Eksempler<br />

0-række/søjle <br />

0 a12 · · · <br />

<br />

0 a22 · · · <br />

= <br />

. .<br />

. ..<br />

<br />

· · · <br />

0 0 · · ·<br />

a21<br />

.<br />

a22<br />

. ..<br />

· · ·<br />

· · ·<br />

<br />

<br />

<br />

<br />

= 0<br />

<br />

<br />

Øvre trekantsmatrix <br />

a11 a12 · · · a1n <br />

<br />

0 a22 · · · a2n <br />

<br />

.<br />

.<br />

.<br />

. .<br />

.<br />

..<br />

.<br />

= a11a22 · · · ann<br />

. <br />

<br />

0 0 · · · ann<br />

<br />

4.9. Rækkeoperationsmatricer ☞ [LA] 8 Determinanter<br />

Observation

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