Math in LMTX and definemathcommand

Math in LMTX and definemathcommand

[Otared Kavian via ntg-context]

Hi Hans,

Thank you for the new upload and the rewriting of the math fonts stuff, thanks also to Mikael S. I did several tests on real size math projects and did not notice important issues.

The two issues I noticed, show up mainly with LucidaOT, and are explained in the following example:

\setupbodyfont[lucidaot]

\definemathstackers[MySymbol]
	[voffset=-1.4\mathexheight, % -.8\mathexheight
	hoffset=\zeropoint,
	mathclass=ord,
	topoffset=.3\mathemwidth, % poor man's italic correction
	middlecommand=\mathematics]

\define[1]\interior{\mathover[MySymbol]{176}{#1}} %2218 U+00B0

\definemathcommand [Argmin]  [limop] {\mfunctionlabeltext{ArgMin}}
\definemathcommand [liminfbar]  [limop] {\underline{\mfunctionlabeltext{lim}}}
\definemathcommand [limsupbar]  [limop] {\overline{\mfunctionlabeltext{lim}}}

\starttext
If $A \subset {\Bbb R}$ is a set, its interior is denoted by $\interior{A}$. Can one have the circle over $A$ slightly bigger (probbaly this is font dependent)?

The built-in commands $\liminf$ and $\limsup$ do not work properly with LucidaOT (I tried other fonts and there they are fine):
\startformula
x_{n} := (-1)^n, \quad\mbox{then} \quad \liminf_{n \geq 0}x_{n} = -1, \quad \limsup_{n\geq 0} x_{n}= +1.
\stopformula

The commands defined above, \type{\liminfbar} and \type{\limsupbar}, behave correctly in all fonts I tested:
\startformula
x_{n} := (-1)^n, \quad\mbox{then} \quad \liminfbar_{n \geq 0}x_{n} = -1, \quad \limsupbar_{n\geq 0}x_{n} = +1,
\stopformula
but not the command \type{\Argmin} (which does not show Argmin in any font…)
\startformula
\Argmin_{x\in {\Bbb R}} (x^2 - x + 1) = {1 \over 2}.
\stopformula

\stoptext

Best regards: Otared
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Re: Math in LMTX and definemathcommand

[Hans Hagen via ntg-context]

On 11/17/2021 10:59 PM, Otared Kavian via ntg-context wrote:
> Hi Hans,
> 
> Thank you for the new upload and the rewriting of the math fonts stuff, thanks also to Mikael S. I did several tests on real size math projects and did not notice important issues.

you missed the multiple primes issue (a bit too agressive lua code 
reduction, fixed in next upload)

> The two issues I noticed, show up mainly with LucidaOT, and are explained in the following example:

thanks, mikael collects all that

> If $A \subset {\Bbb R}$ is a set, its interior is denoted by $\interior{A}$. Can one have the circle over $A$ slightly bigger (probbaly this is font dependent)?

in principle we can scale individual glyphs (and when not default users 
can add their own lfg files)
> The built-in commands $\liminf$ and $\limsup$ do not work properly with LucidaOT (I tried other fonts and there they are fine):

hm .. (in case of lucida, also check cambria and garamond as these have 
staircase kerns too so they are somewhat similar)

mikael is making test (and in the meantime i'm experimenting a bit 
forther with compact fonts because all has to work in that mode too)

Hans

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