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Web skærmformat. - Aarhus Universitet

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V. Matricer – 2. Lineære afbildninger 386<br />

Bemærk<br />

Det er nok, at sum og skalarmultiplikation bevares<br />

f(u + v) = f(u) + f(v)<br />

f(αu) = αf(u)<br />

2.3. Lineær afbildning ☞ [LA] 3 Lineære funktioner<br />

Eksempel<br />

Afbildningen f : R 2 → R 2 givet ved<br />

er lineær.<br />

Bevis<br />

Tilsvarende for skalarmultiplikation.<br />

f(x,y) = (y,x + y)<br />

f((x1,y1) + (x2,y2)) = f(x1 + x2,y1 + y2)<br />

= (y1 + y2,x1 + x2 + y1 + y2)<br />

= (y1,x1 + y1) + (y2,x2 + y2)<br />

= f(x1,y1) + f(x2,y2)<br />

2.4. Matrix til lineær afbildning ☞ [LA] 3 Lineære funktioner<br />

Definition

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