The limit that appears to the right of the limit sign in LaTeX

Question

Why doesn't the infinity u-> disappear when compiling? Instead, it appears to the right of the limit. How to fix it?

\frac{1}{\lim_{u \rightarrow \infty}} 

Answer 1

You need to use \displaystyle :

Try the following:

 \[\frac{1}{\displaystyle \lim_{u \rightarrow \infty}}\] 

Answer 2

 \frac{1}{\lim\limits_{u \rightarrow \infty}}