I'd like to write integrals with the differential first, the way physicists tend to:
$\int dx f(x)$. The problem is that this puts an unsightly (to my eye) gap between the integral sign and the differential, and then puts the integrand much too close to the differential. I can solve this by writing something like
$\int \hskip -3pt dx\ f(x)$, but that is hardly satisfactory.
What is the accepted way to do this? Where should I be looking?