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ε
f(g)
f(g) =
P
N
f
(N)
g
N
f
(N)
N → ∞
f
f
α
(g) = 1/(g − g
0
)
α
f
α
(g) =
X
N
f
(N)
α
g
N
, f
(N)
α
=
(−1)
α
(g
0
)
N+α
Γ(α + N)
Γ(α)N!
.
f
α
lim
N→∞
f
(N)
α
∼
N
α−1
g
N
0
.
g
0
α
f(g)
P
K
i=0
f
(i)
g
i
1/(g−g
0
)
α
f(g) =
1
(g − g
0
)
α
X
i
¯
f
(i)
g
i
,
¯
f
(i)
f
(i)
P
i
¯
f
(i)
g
i
