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

On 4/10/2019 2:19 PM, Aditya Mahajan wrote:

On Wed, 10 Apr 2019, Hans Hagen wrote:


On 4/10/2019 9:40 AM, Mikael P. Sundqvist wrote:

On Wed, Apr 10, 2019 at 9:21 AM Otared Kavian <ota...@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


Hi!

It can be switched off with

\setupmathematics[
collapsing=1,
]

Hope it helps!

Indeed. Aditya is in charge of decisions about these defaults so if you want it differently you need to convince him. (I'm not sure how many users depend on it.)


We can turn it off by default. But it might be better to have a more versbose interface:

\setupmathematics[collapsing=yes|no]

with the default value being collapsing=no.


we already have "none" and th enumbers represent:

1 specials
2 specials + mathlist
3 mathlist + specials


Now that Alan is entering his math in unicode symbols we can default to 'none'.

Hans

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