Equation 13.13.401C8D5126D276

\begin{equation} P_{\theta }\Bigl (a\varphi +(1-a)\psi \Bigr )\geq \frac{a}{a'} P_{\theta }\Bigl (a'\varphi +(1-a')\psi \Bigr )+\frac{a'-a}{a'}\varphi . \end{equation}