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(1)
Existence
that
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p
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e
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In
b
[10],
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The
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to
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under
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n
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s;
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c
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pro
v
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where
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).
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[10]
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Theorem
q
2
e
L
verify
et
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as
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em
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one
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ts:
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)
=
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x;
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w
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H
L
1
to
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a
;
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to
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e
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or
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e
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space
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t
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the
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that
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H
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u
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e
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w
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Theorem
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5
(15)
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u
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x;
L
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t;x
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u
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space-time
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e
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such
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x;
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t;
2
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4
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t;x
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k
4
k
t;x
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n
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2
B
Ob
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2
for
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t
4
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on
:
left-
Mor
side,
e
w
over,
er
(r
seems
e
b
c
p
al
in
l
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(11))
righ
(14)
5side.
An
in
a
v
recall
teresting
2
p
t
oin

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