Equation 23.1.20ED58C2434E12

\begin{equation} \kappa tk_ t- \frac{\mu ^2(1-\eta )h}{1-\eta +h} \left|\zeta -\frac1{1-\eta }\right|^2 \leq C\kappa \exp \left(-\frac1{C\sigma ^2t}\right). \end{equation}