Set W as another weight such thatŴ j =Ŵ j for all j(j = k), andŴ k = 0.
then, for each i, j the following equations hold: and thus, the following equations hold based on the above equations by simple algebraic operations: we conclude that Q(Ŵ ; a, t, λ 1 , λ 2 ) > Q(Ŵ ; a, t, λ 1 , λ 2 ).