A+2E=PAP+P(2E)P P(A+2E)P =P‖A+2E‖P1 =Λ+2E 2+2 22+2 2n+2 =(2+2)(2+2)…(2+2)>2” 1 1 1 1 1 2 1 2 | 2 | | (2 ) | | ( 2 ) | | || 2 || | | 2 | 2 2 2 ( 2)( 2) ( 2) 2 . A E P P P E P P E P P E P E     − − − − + = + = + = + = + + + = + = + + +  n n n      