11''
A
=
e
2
∫
(
1
/
r
12
)
ψ
a
(
1
)
ψ
⋆
b
(
1
)
ψ
⋆
a
(
2
)
ψ
b
(
2
)
d
V
1
d
V
2
A
=
e
2
∫
(
1
/
r
12
)
ψ
a
(
1
)
ψ
b
⋆
(
1
)
ψ
a
⋆
(
2
)
ψ
b
(
2
)
d
V
1
d
V
2
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