06.08.2013 Views

Web skærmformat. - Aarhus Universitet

Web skærmformat. - Aarhus Universitet

Web skærmformat. - Aarhus Universitet

SHOW MORE
SHOW LESS

You also want an ePaper? Increase the reach of your titles

YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.

V. Matricer – 2. Lineære afbildninger 390<br />

Løsning<br />

Søjlerne i 3 × 2-matricen er<br />

f(1,0) = (1,1,0), f(0,1) = (1, −1,1)<br />

Afkryds den korrekte:<br />

(a) (b) (c)<br />

<br />

2.10. Invers matrix ☞ [LA] 4 Inverse matricer<br />

Definition<br />

En kvadratisk n × n-matrix A har en invers matrix B, hvis<br />

B er entydigt bestemt og betegnes<br />

A kaldes invertibel.<br />

Bevis<br />

Entydighed: For AC = I = CA er<br />

AB = In = BA<br />

B = A −1<br />

B = BI = B(AC) = (BA)C = IC = C<br />

2.11. Invers diagonalmatrix ☞ [LA] 4 Inverse matricer

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!