Equation 17.15.161A2FC8833C52

\begin{equation} \begin{split} \psi _{\tau }=\operatorname *{sup}_{}{}\! {}^{*}\left\{ \lambda \Gamma _{\rho }+(1-\lambda )\Gamma '_{\rho '}: \lambda \in (0,1),\rho ,\rho '\in \mathbb {R},\lambda \rho +(1-\lambda )\rho '=\tau \right\} \end{split} \end{equation}