Equation 20.3.366AFB7F7397B

\begin{equation} \tau _{Y,u}(E) :=\lim _{t\to \infty }\frac{\operatorname {ord}_ E\mathfrak a_ t(u;Y)}{t} =\sup _{t>0}\frac{\operatorname {ord}_ E\mathfrak a_ t(u;Y)}{t} \end{equation}