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Web skærmformat. - Aarhus Universitet

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VI. Egenvektorer og diagonalisering – 2. Diagonalisering 475<br />

Vektoren a = (1,3,4,1) har længde<br />

Enhedsvektoren i a’s retning er<br />

a = √ a · a = √ 27<br />

a 1<br />

= ( √ ,<br />

a 27 3<br />

√ ,<br />

27 4<br />

√ ,<br />

27 1<br />

√ )<br />

27<br />

2.40. Skalarprodukt, regneregler ☞ [LA] 11 Skalarprodukt i R n<br />

Regneregler for skalarprodukt<br />

(a,b) ↦→ a · b<br />

(1) a · a = a 2 ≥ 0<br />

(2) a · b = b · a<br />

(3) a · (b + c) = a · b + a · c<br />

(4) a · (λb) = λ(a · b)<br />

(5) a · a = 0 ⇔ a = 0

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