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A4-format til udskrift. - Aarhus Universitet

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164 V. MATRICER<br />

1.4. Rummet ☞ [LA] 1 Koordinatvektorer, [S] 9.1 Three-dimensional co...<br />

Figur<br />

z<br />

x<br />

a<br />

c<br />

0<br />

xn<br />

(a, b, c)<br />

Talrummet R 3<br />

1.5. Addition<br />

Definition<br />

☞ [LA] 1 Koordinatvektorer<br />

Sum af vektorer<br />

⎛ ⎞ ⎛ ⎞ ⎛ ⎞<br />

x1 y1 x1 + y1<br />

⎜<br />

x + y =<br />

. ⎟ ⎜<br />

⎝ . ⎠ +<br />

. ⎟ ⎜<br />

⎝ . ⎠ =<br />

. ⎟<br />

⎝ . ⎠<br />

Eksempel<br />

yn<br />

⎛ ⎞<br />

1<br />

⎛ ⎞<br />

4<br />

⎛ ⎞<br />

5<br />

⎝2⎠<br />

+ ⎝5⎠<br />

= ⎝7⎠<br />

3 6 9<br />

b<br />

xn + yn<br />

1.6. Skalering<br />

Definition<br />

Skalarmultiplikation af skalar (tal) og vektor<br />

☞ [LA] 1 Koordinatvektorer<br />

⎛ ⎞ ⎛ ⎞<br />

Eksempel<br />

⎜<br />

αx = α ⎝<br />

x1<br />

.<br />

xn<br />

⎟<br />

⎠ =<br />

⎜<br />

⎝<br />

⎛ ⎞ ⎛ ⎞<br />

1 3<br />

3⎝2⎠<br />

= ⎝6⎠<br />

3 9<br />

1.7. Regneregler ☞ [LA] 1 Koordinatvektorer<br />

Regneregler<br />

(1) Kommutativ lov<br />

(2) Associativ lov<br />

u + v = v + u<br />

αx1<br />

.<br />

αxn<br />

⎟<br />

⎠<br />

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

y

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