equation icon  mnab -(n-4){ m (a b) n mn ( a b ) K (x) =_ -m 2@ @ DFn(x) @ @ DFn(x) + 2D @ DFn(x)@ DFn(x) ab m n mn ab ( 2 ) +2D[ (@ DFn(x) @ DFn(x)) + 2D D D Fn(x) + jmn@(aD (x)@b) + jab@(mD (x)@n) + D (0)(jmnDab + jabDmn) Fn Fn Fn 1- mn ab ( 2 )] n } + 4j j DFn(x)[] - m DFn(0) d (x) . (97)