math fractions

math fractions

[Alan BRASLAU]

Hi,

Does anyone have a suggestion to generate a better result
for the symmetry specification:

\starttext
${2\over a}{2\over b}{2\over m}$
\stoptext

I tried:

\starttext
${2\over \vphantom{b}a}{2\over \vphantom{b}b}{2\over \vphantom{b}m}$
\stoptext

but this leaves too much vertical space - compare it to:

\starttext
${2\over \vphantom{b}a}{2\over b}{2\over \vphantom{b}m}$
\stoptext

Can this be a bug in ConTeXt math spacing?

Alan
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Re: math fractions

[Wolfgang Schuster]

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> Alan BRASLAU <mailto:alan.braslau@cea.fr>
> 4. November 2015 um 17:50
> Hi,
>
> Does anyone have a suggestion to generate a better result
> for the symmetry specification:
>
> \starttext
> ${2\over a}{2\over b}{2\over m}$
> \stoptext
>
> I tried:
>
> \starttext
> ${2\over \vphantom{b}a}{2\over \vphantom{b}b}{2\over \vphantom{b}m}$
> \stoptext
>
> but this leaves too much vertical space - compare it to:
>
> \starttext
> ${2\over \vphantom{b}a}{2\over b}{2\over \vphantom{b}m}$
> \stoptext
>
> Can this be a bug in ConTeXt math spacing?
Use the \frac command.

\starttext
$\frac{2}{a}\frac{2}{b}\frac{2}{m}$
\stoptext

Wolfgang

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Re: math fractions

[Alan BRASLAU]

Thank you, Wolfgang.

I had stopped using the \frac command a while ago
as it was *seriously broken*, previously.

Why, however, does the TeX construction {a\over b}
not work correctly, and more precisely, why does the TeX
command \vphantom{b} not give the desired result?

Alan 


On Wed, 4 Nov 2015 18:13:33 +0100
Wolfgang Schuster <schuster.wolfgang@gmail.com> wrote:

> $\frac{2}{a}\frac{2}{b}\frac{2}{m}$

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Math fractions

[Aditya Mahajan]

Something is wrong in the current implmentation of \tfrac.

If we take away all the bells and whistles provided by 
\definemathfraction,

* \tfrac#1#2 should be equal to {\textstyle #2 \over #1}
* \dfrac#1#2 should be equal to {\displaystyle #2 \over #1}
* \frac should be equal to \tfrac in inline math and \dfrac in display 
math.

In the current implmentation \frac works correctly, but \tfrac does not. 
For example:

\startbuffer
   \frac 12 \tfrac 12 \dfrac 12
\stopbuffer

\starttext
$\getbuffer$
\startformula  \getbuffer \stopformula
\stoptext

The output of \frac and \dfrac is correct in both inline and display mode.

The output of \tfrac is wrong in both modes. In both modes, \tfrac should 
equal the current output of \frac in inline mode.

Although I don't completely understand the code, my guess is that there is 
a bug in how mathstyle=text is implemented (really, mathstyle=text should 
be equivalent to mathstyle=empty in inline math mode).

Thanks,
Aditya
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