Equation Icon  ( ) ea sum k sum n ie @Lm ac... fi+1...fng... h... s b := (- )dei \~/ ei-1... \~/ e1 ---------------c...-- D bei+1...end...h... \~/ fi+1... \~/ fnPN g.... (2) n=1 i=1 @( \~/ e1... \~/ enPN d...)