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Web skærmformat. - Aarhus Universitet

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III. Potensrækker – 2. Talfølger og rækker 278<br />

og er da divergent.<br />

2.29. Nyttige regler<br />

8 Sætning (Regneregler)<br />

☞ [S] 8.2 Series<br />

(i)<br />

∞<br />

∞<br />

can = c<br />

(ii)<br />

(iii)<br />

n=1<br />

n=1<br />

∞<br />

∞<br />

(an + bn) =<br />

n=1<br />

n=1<br />

∞<br />

∞<br />

(an − bn) =<br />

n=1<br />

n=1<br />

an<br />

an +<br />

an −<br />

2.30. Opgave ☞ [S] 8.2 Series Øvelse 28<br />

Undersøg rækken<br />

∞<br />

ln( n<br />

n + 1 )<br />

n=1<br />

∞<br />

n=1<br />

∞<br />

n=1<br />

Ledene konvergerer<br />

ln( n<br />

) → ln(1) = 0 for<br />

n + 1<br />

n → ∞<br />

så divergenstesten giver os intet.<br />

bn<br />

bn

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