Equation 14.8.3578022E3660A

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