On 2014–02–09 Jaroslav Hajtmar wrote:

How can type big integral sign to result looked good?

Here is my example:

\startformula \int \frac{P_n(x)}{Q_m(x)} \, \mathrm{d}x, \quad n

I don't know how to reduce the space between the integral sign and the fraction (I assume that's what you meant, by “not looking good”) except using a manual correction (e.g. \!, or \edef\int{\int\mskip-10mu}). As a side note: \mathrm is a font switch, it doesn't take an argument. Use {\mathrm d}x instead of \mathrm{d}x. Marco