It is very easy to put a tilde over the symbol in math mode. Simply type $\tilde{a}$
. But how to put a tilde under the symbol in math mode?
5 Answers
The undertilde
package provides extensible tilde accents under elements in math mode via \utilde{<symbols>}
. Try, for example:
\documentclass{minimal}
\usepackage{undertilde}
\begin{document}
This is $\frac{\utilde{ab}}{c} \neq \frac{ab}{c}$ and so on.
\end{document}
Alternatively, as @egreg suggests, the accents
package provides \underaccent[<accent>]{<symbol>}
. Try, for example:
\documentclass{minimal}
\usepackage{accents}
\begin{document}
This is $\underaccent{\tilde}{\mathcal{A}}$ and so on.
\end{document}
See page 2 of the package documentation in order to extend this using \widetilde
rather than \tilde
. It depends on your preference.
-
2It seems that
\usepackage{under tilde}
is unavailable in TeXLive, only in MiKTeX.– YrogirgJul 18, 2015 at 10:30 -
1The solution can be found in tex.stackexchange.com/questions/220626/…– YrogirgJul 18, 2015 at 10:39
We can define a macro:
\def\underacc #1/#2{\mathchoice{\uacc\textstyle{#1}{#2}}{\uacc\textstyle{#1}{#2}}
{\uacc\scriptstyle{#1}{#2}}{\uacc\scriptscriptstyle{#1}{#2}}}
\def\uacc#1#2#3{\mathop{#2{}}\limits_{#1#3{}}}
%test:
$\underacc a/\tilde, \tilde a$
Using «amssymb» package we can use macro such as \lesssim if we want to place '~' below '<'. Similarly \eqsim and \gtrsim if we want to place '~' below = or '>'
-
2
In 2021, the most convenient way is use the accents
package
\documentclass{minimal}
\usepackage{accents}
\begin{document}
This is $\undertilde{\mathcal{A}}$ and so on.
\end{document}
`
to mark your inline code as I did in my edit.