Stacking math symbols

Stacking math symbols

[Nicola]

I find it a bit surprising that ConTeXt gives 'missing } inserted'
with:

\starttext\startformula
\mathop=^{\rm def}
\stopformula\stoptext

(\mathop{=}^... is fine, though).

The above formula is correct in Plain (Lua)TeX (in fact, it is
copied from The TeX Book). Why does ConTeXt need braces?

(Before you point it out: I know that I should use \stackrel…)

Nicola


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Re: Stacking math symbols

[Hans Hagen]

On 2/23/2016 7:31 PM, Nicola wrote:
> I find it a bit surprising that ConTeXt gives 'missing } inserted'
> with:
>
> \starttext\startformula
> \mathop=^{\rm def}
> \stopformula\stoptext
>
> (\mathop{=}^... is fine, though).
>
> The above formula is correct in Plain (Lua)TeX (in fact, it is
> copied from The TeX Book). Why does ConTeXt need braces?

this is because \mathop is redefined (in th eprocess assuming a braced 
argument) ... this is a mkii leftover which is actually no longer needed 
(mkii needed more tweaks to get fonts right)

you can add this to cont-new.mkiv

\let\mathop\normalmathop

but i'd use { } anyway

> (Before you point it out: I know that I should use \stackrel…)

don't worry ... i would not have thought of it (i never have to enter 
that kind of math)

Hans


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Re: Stacking math symbols

[Nicola]

On 2016-02-23 21:11:11 +0000, Hans Hagen said:

> On 2/23/2016 7:31 PM, Nicola wrote:
>> I find it a bit surprising that ConTeXt gives 'missing } inserted'
>> with:
>> 
>> \starttext\startformula
>> \mathop=^{\rm def}
>> \stopformula\stoptext
>> 
>> (\mathop{=}^... is fine, though).
>> 
>> The above formula is correct in Plain (Lua)TeX (in fact, it is
>> copied from The TeX Book). Why does ConTeXt need braces?
> 
> this is because \mathop is redefined (in th eprocess assuming a braced
> argument) ... this is a mkii leftover which is actually no longer needed
> (mkii needed more tweaks to get fonts right)
> 
> you can add this to cont-new.mkiv
> 
> \let\mathop\normalmathop
> 
> but i'd use { } anyway

Thanks for the clarification!

Nicola


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