( ) = ∑ ( ) ( )
2
=1
± 1
→ −
( )
( )
( )
( ) ( )
( )
( )
( ) = ( ) − ( ) ≡ ( ) − ( ) = ( ) − ∑ ( ) ( )
2
=1
( ))
2
( ) =
= [ ( ) − ∑ ( ) ( )]
=1
( )
2
2
= ∑ ( ) ( ( ))
=1
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