Is there any way of modifying the preamble, so instead of typing
$\mathtt{x}$ ...
\begin{eqnarray}
\mathtt{y} & \mathtt{=} & \mathtt{z^\pi}
\end{eqnarray}
I can omit the \mathtt{…} commands?
[Tex/LaTex] change all math output to use monospaced text
fontsmath-modetypewriter
Related Solutions
You gain nothing, in my opinion, in having two different commands: just say
This is some text with \(\sabc\) and a formula \(\sabc+x\).
If you want to save some keystrokes, use
This is some text with $\sabc$ and a formula $\sabc+x$.
Math should be always math. With two commands you'll almost surely end up with using the wrong one and editing will be painful.
A different approach might be to say
\usepackage{xspace}
\newcommand{\sabc}{\ensuremath{A_{\mathrm{b}}^c}\xspace}
using \sabc both in text and math. But with the former approach you'll get the benefit of correct syntax highlighting, if your editor does it.
You just need to encourage latex to initialise the font setup in scriptstyle as well as the main textstyle. As you notice, it doesn't do this until it thinks it is needed:
\documentclass{minimal}
\usepackage{amsmath}
\newcommand{\ttmath}{%
\everymath{%
{\scriptstyle\mathtt{}}%
{\scriptscriptstyle\mathtt{}}%
\mathtt{\xdef\tmp{\fam\the\fam\relax}\aftergroup\tmp}}}
\newcommand{\val}[1]{\bgroup\ttmath\texttt{#1}\egroup}
\begin{document}
\val{1\ensuremath{\ensuremath{\cdot}10\ensuremath{^{-6}}}}
\ensuremath{a_0}, \ensuremath{m_{\text{e}}}).
\val{1\ensuremath{\ensuremath{\cdot}10\ensuremath{^{-6}}}}
\end{document}
Best Answer
You can add
to the document preamble (or the part of the document where you need this)
and
if you need display math as well.
In then in addition you may need to force the initialisation by putting
in the preamble otherwise the first expression may not be initialised correctly. This just makes an empty math expression on a box and discards it to avoid the problem.