Formula_23573

\[\xi_{\alpha}=\frac{\partial \omega Y_{0}}{\partial Y_{\alpha}}, \quad \xi_{\alpha k}=-\frac{\partial \omega Y_{k}}{\partial Y_{\alpha}}+\frac{\partial \omega}{\partial v_{s k}} Y_{0} \frac{\partial}{\partial Y_{\alpha}} \frac{Y_{4}+\boldsymbol{Y v}_{s}}{Y_{0}},\]