Hi,
in a formula I write <math>\frac{\sum_{i=1}^n ...}{...}</math>. The sum sign appears always in \textmode. I tried to use <math>\frac{\displaystyle \sum_{i=1}^n ...}{...}</math>, but during rendering an error occured: unknown function \displaystyle. What can I do to force \displaystyle ?
Thanks in advance
Sigbert Klinke