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I am sorry. Here is an example:

\documentclass[12pt]{article}
\usepackage{undertilde}
\begin{document}
\begin{equation}
\utilde{a} \utilde{f}
\end{equation}
\begin{equation}
\left[\begin{array}{c}
\utilde{a}\\ \utilde{f}
\end{array}\right]
\end{equation}
\end{document}

In the first equation, the ...

Hello,

my question is about symbols with an 'undertilde' (\utilde{a}) stacked in an array. utilde in a normal equation looks fine. But as soon as put it in an array, the utilde shifts up with respect to the symbol. In the case of \utilde{a} the tilde is printed over the bottom of the 'a'. Not so ...

Thanks.
That was helpful

I would like to place a dot under a symbol in math modes.
Something like underline or utilde, but with a simple dot.
\d will not do, since this is only defined in text modes.

All suggestions are welcome.

Many thanks in advance.

Erica