# Mathematical notation of convergence in latex

How can I type this notation in latex?

• With amsmath use f_n \xrightarrow{\mu} f. Jan 30, 2016 at 20:47
• Thanks a lot, it works!!! But the arrow is a bit short, how can I make it longer? Jan 30, 2016 at 20:51
• Like this for example: f_n \xrightarrow{\enskip\mu\enskip} f . Alternatively you could use a longrightarrow and overset. This way the arrow is always the same length: f_n \overset{\mu}{\longrightarrow} f. Jan 30, 2016 at 20:52
• @Benjamin: It is exactly what I'm looking for. Thanks a lot!!! Jan 30, 2016 at 20:55
• Or you define your own custom xrightarrow with a fixed width: \newcommand{\myrightarrow}[1]{\xrightarrow{\makebox[2em][c]{$\scriptstyle#1$}}}. You can use it then like this: f_n \myrightarrow{\mu} f Jan 30, 2016 at 20:59

As Sigur mentioned in the comments you could use amsmath's \xrightarrow{•}.

f_n \xrightarrow{\mu} f


Unfortunately this leads to a quite short arrow:

There are multiple options to get a longer arrow. You could just add some space at the left and right. But this still leads to differently long arrows depending on the overset content.

f_n \xrightarrow{\enskip\mu\enskip} f
f_n \xrightarrow{\enskip L^p\enskip} f


To prevent this you could use \overset{•}{•} combined with a \longrightarrow.

f_n \overset{\mu}{\longrightarrow} f
f_n \overset{L^p}{\longrightarrow} f


But in this case imho the arrow is still a little bit short. So the best way is probably to define a custom \xrightarrow with a fixed width like this. Change the predefined value 2em to get a shorter or longer arrow.

\newcommand{\myrightarrow}[1]{\xrightarrow{\makebox[2em][c]{$\scriptstyle#1$}}}‌


Which can then easily be used like this:

f_n \myrightarrow{\mu} f
f_n \myrightarrow{L^p} f


Building on Benjamin's answer, if anyone looking for how to get the text under the arrow, you can use [\mu]{} instead of {\mu}.

f_n \xrightarrow[\mu]{} f


Similarly, if you want the arrows to be longer, you can add some space to either side

f_n \xrightarrow[\enskip\mu\enskip]{} f
f_n \xrightarrow[\enskip L^p\enskip]{} f


Lastly, you could also get them the same size by using the \longrightarrow

f_n \underset{\mu}{\longrightarrow} f
f_n \underset{L^p}{\longrightarrow} f