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



 ?   A


   

≤ −

⇔ − ≥ ⇔ − − ≥ ⇔

≥

$n*':l0F8%0.%-81#Y*+,%-./%e@
 ≥

,-/
Q=@bLK?L'#!%F6%@\
7
?
?'g,S*+,%-@
?
L L2 = −
ur

7

?'g,S*+,%-@

  ?
/
/
 0 8 /
/
α
=
− + +

= ⇔ = ⇔ + = ⇔

= −
+ +


)CP*9%-je%&0V0@>

?
α
>EAL

α
>E?A
#BH
∆
@+T%-9%-U0b''0G%--':
α
$*1
Q'
α



5D%-':-1Q'
?
α
@%-81*+,%-./%
K?A
⇔
kkA
?⇔ = −

Q0.$*1Q'
?
α
@>JALKL
5+,%-"$*1Q'

α
@ML?L
9/
:;</=>?/@/@/'23A/B/C/D2EF

 !!"#$%&'()*+,