Формула Серажетдинов

$\left(\frac{\partial T}{\partial X_a}\right)_{S,V,X_{b\ne a}}=\left(\frac{\partial Y_a}{\partial S}\right)_{V,X},\qquad -\left(\frac{\partial S}{\partial X_a}\right)_{T,V,X_{b\ne a}}=\left(\frac{\partial Y_a}{\partial T}\right)_{V,X},</math$