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Att ta absolutbeloppet av en vektors koordinater är samma sak som att beräkna vektorns längd. Vektorn

v = (1, 2)

har alltså längden

∣ (1, 2) ∣ = 1^{2} + 2^{2} = 5 le .

Detta kan motiveras med Pythagoras sats.

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