Equation 14.8.211F81D837A44

\begin{align} \dot b_ t& =-\int _ X\dot F_ t\, \mathrm{d}\mu _{u_ t},\\ \ddot b_ t& =-\int _ X\ddot F_ t\, \mathrm{d}\mu _{u_ t} -\int _ X\operatorname {tr}(A_ t^2)\, \mathrm{d}\mu _{u_ t}.\tag{14.8.3} \end{align}