# [NTG-context] Lucida-1.901 (2023-01-21) available

Hans Hagen j.hagen at freedom.nl
Thu Jan 26 10:33:54 CET 2023

On 1/25/2023 6:24 PM, Mikael Sundqvist via ntg-context wrote:
> On Wed, Jan 25, 2023 at 11:02 AM Otared Kavian via ntg-context
> <ntg-context at ntg.nl> wrote:
>>
>> Hi,
>>
>> Thanks Hraban for the information and the link to the article by Hans and Mikael about the math fonts in Lucida.
>>
>> I very much appreciated that article: one sees how the handling of almost impercebtile details in ConTeXt make us to adhere to and love LuaMetaTeXâ€¦ So a great thank you to Hans and Mikael for all this work!
>>
>> Regarding the details of vertical alignment in math, I wonder whether the column Â« : Â» in front of the equal sign Â« = Â», in the combination Â« := Â» (used to define for instance a new variable) should be alos centered around the math axis, as explained in the article. For instance in the following example
>>
>> \setupbodyfont[lucidaot,12pt]
>> \starttext
>> \startformula
>> f(x) := -(u|x) := - \langle u, x \rangle
>> \stopformula
>> \stopformula
>> \startformula
>> f : A \longrightarrow B
>> \stopformula
>> \stoptext
>>
>> it seems to me that the lower dot (or squareâ€¦) in the semicolumn of the first formula (in front of the equal sign) is lower than in the second formula.
>>
>> Best regards: Otared
>
> Thank you for the kind words, Otared,
>
> Regarding the colons (and other symbols with "dots"), I would say it
> is still not optimal in Lucida (and difficult to make it "consistent",
> there are too many symbols that are at the moment different). But in
> your example you can use \colonequals and \colon if you prefer. They
> are centered around the math axis.
>
> Best, Mikael
>
> \setupbodyfont[lucidaot,12pt]
> \starttext
> \startformula
> f(x) := -(u|x) \colonequals - \langle u, x \rangle
> \stopformula
> \startformula
> f : A \longrightarrow B \breakhere
> f \colon A \longrightarrow B
> \stopformula
> \startformula
> \mathaxisbelow := \colonequals : \colon
> \stopformula
> \stoptext
There is a (experimental as we played with it and then got distracted)
feature that makes some symbols adapt to spacing in the input.

\starttext

\setupmathematics[autospacing=yes]

\setupmathematics[collapsing=2]

\im{A:B} and \im{A : B}\par
\im{A:=B} and \im{A := B}\par
\im{A\colonequals B} and \im{A {\colonequals} B}\par

\stoptext

the second line is not yet ok as collapsing the := (old feature) comes
at the wrong time when we do autospacing (something Mikasl and I now
need to discuss and test)

This autospacing is part of some larger effort, for instance we can also
auto handle fences and so. All this relates to minimizing the input and
make it a bit more natural. Think (1,2) vb (1, 2) where we - due to the
many more classes that we have - want spacing to be right.

All will be revealed in the upcoming releases and the upcoming 3145 page
math manual.

Hans

-----------------------------------------------------------------