E
2
0
Σ
=
E
2
0
k
{
∑
exp
(
i
φ
k
)
}
{
∑
exp
(
−
i
φ
k
)
}
E
0
Σ
2
=
E
0
k
2
{
∑
exp
(
i
φ
k
)
}
{
∑
exp
(
−
i
φ
k
)
}
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