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Samenvatting Lecture Notes H7: Reeksen | Wiskunde B | UGent | 2024/25

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Deze collegeaantekeningen behandelen Hoofdstuk 7 over Reeksen uit het Wiskunde B-vak voor Bachelor Handelsingenieur aan Universiteit Gent. De stof omvat getallenreeksen, convergentie en divergentie van reeksen, partieelsommen, en Taylorreeksen van functies met praktische voorbeelden zoals de logaritmische reeks. Ideaal voor examenvoorbereiding en het begrijpen van de theoretische concepten die in het vak worden behandeld.

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H7: Reeksen

Prof. Dr. Chris Cornelis

Vakgroep Wiskunde, Informatica en Statistiek (WINST)
Faculteit Wetenschappen
Universiteit Gent


Academiejaar 2024–2025




Prof. Dr. Chris Cornelis H7: Reeksen Academiejaar 2024–2025

, 7.1 Getallenreeksen


Oneindige reeks
Reeks = “oneindige som van getallen”
Voorbeeld
1 1 1 1 1 1 1 1
+ + + + ··· = + + + + ···
2 6 12 20 1·2 2·3 3·4 4·5
Formeel: getallenrij met termen un (n → N). In het voorbeeld:
1 1 1 1 1
u0 = , u1 = , u2 = , u3 = , · · · , un =
1·2 2·3 3·4 4·5 (n + 1)(n + 2)
Partieelsom sn :
n
algementerm
!
s n = u0 + u1 + · · · + un = uk
k=0

Hieruit: rij der partieelsommen s = s0 , s1 , s2 , . . .
!→ !
Oneindige reeks: un = un = lim sn
n→+→
n=0
Prof. Dr. Chris Cornelis H7: Reeksen Academiejaar 2024–2025

, 7.1 Getallenreeksen


Gedrag van een reeks

n
!
s n = u0 + u1 + · · · + un = uk
k=0
"
1 s convergeert ⇔ un convergeert:

lim en = l ce cu
"
2 s divergeert ⇔ un divergeert:
ofwel :lim =
ofwel:linn bestaat mit un bestaat niet


opM : him (en = + -
= En = -
n -0




Prof. Dr. Chris Cornelis H7: Reeksen Academiejaar 2024–2025

, 7.1 Getallenreeksen


Gedrag van een reeks: voorbeelden

! 1
Voorbeeld 1:
(n + 1)(n + 2)
n=0
Splitsen in partieelbreuken

un =

n
= 1
-


m

enuk -- =




= 1 -


+2
n




=lin en





Prof. Dr. Chris Cornelis H7: Reeksen Academiejaar 2024–2025

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