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Web skærmformat. - Aarhus Universitet

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V. Matricer – 4. Determinanter 429<br />

4.19. Brug inversreglen<br />

Eksempel<br />

☞ [LA] 8 Determinanter<br />

Matricen<br />

⎛<br />

1 2<br />

⎞<br />

3<br />

A = ⎝4<br />

5 6⎠<br />

har determinant<br />

2 3 0<br />

|A| = 12<br />

A er invertibel og den inverse har determinant<br />

|A −1 | = |A| −1 = 1<br />

12<br />

4.20. Test inversregel ☞ [LA] 8 Determinanter<br />

Test<br />

Determinanten af en invertibel matrix er altid = 0.<br />

Løsning<br />

Sætning 12 giver svaret direkte.<br />

Afkryds:<br />

ja nej<br />

<br />

4.21. Test produktreglen ☞ [LA] 8 Determinanter

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