# [NTG-context] Strange behavior in math mode: < and minus sign give leftarrow

Mikael P. Sundqvist mickep at gmail.com
Wed Apr 10 09:40:51 CEST 2019

On Wed, Apr 10, 2019 at 9:21 AM Otared Kavian <otared at gmail.com> wrote:
>
> Hi Hans,
>
> While testing old documents with lmtx, I noticed that with recent versions of mkiv, as well as LuaMetaTeX, there is a strange behavior in math mode: when the characters < and - follow each other one gets \leftarrow… This is embarrassing when one writes inequalities for negative numbers.
> So one has to separate them in order to obtain with curly braces. Can this be fixed or is it intended ?
>
> \starttext
> $\alpha < -1$
>
> $\alpha \leftarrow 1$
>
> $\alpha < {-1}$
>
> $\alpha {<} - 1$
> \stoptext
>
> Best regards: OK
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Hi!

It can be switched off with

\setupmathematics[
collapsing=1,
]

Hope it helps!

/Mikael