tilde{z}-0}\left\{y^{-0} \left(\frac {\partial \varphi}{\partial y}\right)^{-0}\left[ \frac{\partial \varphi}{\partial y} \frac{\partial Q_j}{\partial \lambda_i}- \frac{\partial \varphi}{\partial \lambda_i} \frac{\partial Q_j}{\partial y}+ \right.\right.