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Samenvatting FEB21019 Matrix Algebra

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In deze samenvatting staat alles wat je nodig hebt voor het tentamen van het vak Matrix Algebra van de studie econometrie en operationele research aan de Erasmus Universiteit.

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, 2
1 s 1



getal
↳ i is een
imaginair
complexe getallen : = Ea + bER]
bi 1 a ,



↳ kan deten
je optellen ,
aftrehlen ,
vermenigvuldigen en




GRelzl en beIm(2)
E =
a-bi
3
is

de
gesonjngeerde va n atbi
-




ZE - G . b
-




1 E EZ
↳ ook wel de afstand van z tot de oorsprong


Bekijk zatbi ,
met Izl = r
,
das a + br2
=> z =
r(cos(y) +
isin(y)
-
hock/argument lot X-as

stelling van de moivre :

neN
Als z
=
r/c0s y + isin
y) ,
dan geldt voor alle
z =
r"(cos(nyl + isin (ny))
de Formule van Euler :


elk complex getal za + bi is te schrijven als z-reil
-




modulus v = 1zl =
afp
argument
-




0s452π


hoofdstelling van de algebra :


Zj plz) anz" +... + = a
,
z +
90 polynoom
een van

graad n71 Dan zijn .
er n
complexe getallen
dat
Z ---
En waarvoor geldt
p(z) =
an(z-z , ) ...
(2 -


Ent
Als geldt p(x +
yi) =
0 dan geldt p(X-yi) =
o ook .




de oplossingen van ax" bx C
zijn
te lossen
op
+ : 0


met :



X = -- als DO maar
je er di
a van om de wortel te kunnen
nemen

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