Start
Zufällige Seite
Anmelden
Einstellungen
Spenden
Über Wikibooks
Haftungsausschluss
Suchen
Formelsammlung Mathematik: Erzeugende Funktionen
Sprache
Beobachten
Bearbeiten
↑
Formelsammlung Mathematik
G
{
f
n
}
{\displaystyle G\{f_{n}\}}
: Erzeugende Funktion der Folge
f
n
{\displaystyle f_{n}}
Z
{
f
n
}
{\displaystyle {\mathcal {Z}}\{f_{n}\}}
: Z-Transformierte (unilateral) der Folge
f
n
{\displaystyle f_{n}}
Konvergenzbereich: für
x
∈
C
{\displaystyle x\in \mathbb {C} }
f
0
,
f
1
,
f
2
,
f
3
,
f
4
,
…
{\displaystyle f_{0},f_{1},f_{2},f_{3},f_{4},\ldots }
f
n
{\displaystyle f_{n}}
G
{
f
n
}
(
x
)
{\displaystyle G\{f_{n}\}(x)}
Z
{
f
n
}
(
z
)
{\displaystyle {\mathcal {Z}}\{f_{n}\}(z)}
Konvergenzbereich
1, 0, 0, 0, 0, …
[
n
=
0
]
{\displaystyle [n=0]}
1
{\displaystyle 1}
1
{\displaystyle 1}
C
{\displaystyle \mathbb {C} }
0, 1, 0, 0, 0, …
[
n
=
1
]
{\displaystyle [n=1]}
x
{\displaystyle x}
1
z
{\displaystyle {\frac {1}{z}}}
C
{\displaystyle \mathbb {C} }
0, 0, …, 0, 1, 0, …
[
n
=
k
]
{\displaystyle [n=k]}
x
k
{\displaystyle x^{k}}
(
1
z
)
k
{\displaystyle {\Big (}{\frac {1}{z}}{\Big )}^{k}}
C
{\displaystyle \mathbb {C} }
1, 1, 1, 1, 1, …
1
{\displaystyle 1}
1
1
−
x
{\displaystyle {\frac {1}{1-x}}}
z
z
−
1
{\displaystyle {\frac {z}{z-1}}}
|
x
|
<
1
{\displaystyle |x|<1}
1,
q
,
q
2
,
q
3
,
q
4
, …
q
n
{\displaystyle q^{n}}
1
1
−
q
x
{\displaystyle {\frac {1}{1-qx}}}
z
z
−
q
{\displaystyle {\frac {z}{z-q}}}
|
q
x
|
<
1
{\displaystyle |qx|<1}
1, −1, 1, −1, 1, …
(
−
1
)
n
{\displaystyle (-1)^{n}}
1
1
+
x
{\displaystyle {\frac {1}{1+x}}}
z
z
+
1
{\displaystyle {\frac {z}{z+1}}}
|
x
|
<
1
{\displaystyle |x|<1}
0, 1, 2, 3, 4, …
n
{\displaystyle n}
x
(
1
−
x
)
2
{\displaystyle {\frac {x}{(1-x)^{2}}}}
z
(
z
−
1
)
2
{\displaystyle {\frac {z}{(z-1)^{2}}}}
|
x
|
<
1
{\displaystyle |x|<1}
1, 2, 3, 4, 5, …
n
+
1
{\displaystyle n+1}
1
(
1
−
x
)
2
{\displaystyle {\frac {1}{(1-x)^{2}}}}
z
2
(
z
−
1
)
2
{\displaystyle {\frac {z^{2}}{(z-1)^{2}}}}
|
x
|
<
1
{\displaystyle |x|<1}
a
, 1+
a
, 2+
a
, 3+
a
, …
n
+
a
{\displaystyle n+a}
a
+
(
1
−
a
)
x
(
1
−
x
)
2
{\displaystyle {\frac {a+(1-a)x}{(1-x)^{2}}}}
a
z
2
+
(
1
−
a
)
z
(
z
−
1
)
2
{\displaystyle {\frac {az^{2}+(1-a)z}{(z-1)^{2}}}}
|
x
|
<
1
{\displaystyle |x|<1}
0, 1, 4, 9, 16, …
n
2
{\displaystyle n^{2}}
x
(
x
+
1
)
(
1
−
x
)
3
{\displaystyle {\frac {x(x+1)}{(1-x)^{3}}}}
z
(
z
+
1
)
(
z
−
1
)
3
{\displaystyle {\frac {z(z+1)}{(z-1)^{3}}}}
|
x
|
<
1
{\displaystyle |x|<1}
1, 0, 1, 0, 1, …
[
2
|
n
]
{\displaystyle [2\,|\,n]}
1
1
−
x
2
{\displaystyle {\frac {1}{1-x^{2}}}}
z
2
z
2
−
1
{\displaystyle {\frac {z^{2}}{z^{2}-1}}}
|
x
|
<
1
{\displaystyle |x|<1}
0, 1, 0, 1, 0, …
[
2
|
n
+
1
]
{\displaystyle [2\,|\,n+1]}
x
1
−
x
2
{\displaystyle {\frac {x}{1-x^{2}}}}
z
z
2
−
1
{\displaystyle {\frac {z}{z^{2}-1}}}
|
x
|
<
1
{\displaystyle |x|<1}