When reading about an certain algorithm (about parameter estimation for Kalman Filtering page 7 eq 57) I found this notation:
$\int dx f(x)$
which is normally written as $\int f(x) dx$. I spent a significant time to figure this out. Now my question: Why would anybody use such a misleading notation? Is this a convention in certain areas?
I still don't know where the integrand ends and up to now I am pretty convinced that this notation is very harmful, since $\int dx$ also has a meaning.