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' )ˆ(
4
)ˆ, ,( ) ,(
,
)ˆ ˆ( )ˆ ˆ(
1
1
)ˆ ˆ, ,( 2/1 ) ,(,
,
0
'
0
) ,( ) ,(
,
) ,(, )ˆ, ,(
    = 
   

−
 → =→




=

−=
 → =
d m
l
Y Er Er
ml
d
lP E Ers E Erls
dE
l
m
l
Y
l
l m
Er
ml
E Erls Er scat q

 
  
 
 
  
Ed d Er E Ers Er scat q      →


 = ˆ )ˆ, ,( )ˆ ˆ,
,(
04
)ˆ, ,(
  


The method
OK.
Let us agree that instead of :
qscat can be written as :
is there a benefit?