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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 00:58, Andrew Parsloe wrote:
> Only recently have I learnt to distinguish inline from display-style
> maths mode by using \mode_if_inner:TF. It would be helpful for those of
> us who come to expl3 programming without a good prior grounding in TeX
> if a comment to this effect could be added to the documentation
> (interface3.pdf).
>
> Andrew

\mode_if_inner:TF is a wrapper around \ifinner so can't be used to
distinguish inline from display. In fact in math \ifinner can't be used
to detect much useful at all, the points at which tex is or is not in
inner math mode are not usually interesting. (Unlike testing for inner
when in vertical mode that tells you if you are in a box or on the main
vertical list)


David
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