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From: David Carlisle <davidc@NAG.CO.UK>
Subject: Re: Distinguishing display styles in math mode
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On 16/01/2017 10:23, Andrew Parsloe wrote:
> I'm not qualified to argue about the use of \mode_if_inner:TF beyond
> saying that it has correctly worked to date.

Any apparent correspondence between inner and outer math and
displaystyle and textstyle is more or less accidental.


Consider

\documentclass{article}

\usepackage{amsmath}

\newcommand\test[1]{%
\relax\ifinner\typeout{#1 inner}\else\typeout{#1 outer}\fi
\sum_0^n
}
\begin{document}

$\test{$}$


\[\test{[} \left(\test{[2}\right) \]


\begin{eqnarray}
\test{eqnarray} &=&0
\end{eqnarray}

\begin{align}
\test{align}&=1
\end{align}


\end{document}


all but the first sum is set in display math mode but all but the second
have ifinner true.

$ inner
[ outer
[2 inner
eqnarray inner
align inner
align inner


David

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