M( 1()*∑(m=n T M、)=∑M(O-nO,) M,(o)==M (a)+∑M(-no,) T T n≠0  =−  = − n s M n s T M ( ) ( ) s    1 10   = + − 0 s s ( ) 1 ( ) 1 ( ) n s M n s T M T M     1 ( ) ( )* ( ) s s s n M M n T       =−   = −     