Am Donnerstag, den 24.11.2011, 15:59 +0100 schrieb Hans Hagen:
> On 24-11-2011 11:46, Paul Menzel wrote:

> > having upgraded
> >
> >          ConTeXt  ver: 2011.10.14 22:47 MKIV  fmt: 2011.10.15  int: english/english.
> >
> > to
> >
> >          ConTeXt  ver: 2011.11.23 18:58 MKIV  fmt: 2011.11.24  int: english/english
> >
> > With
> >
> >          \starttext
> >          	\placeformula
> >          	\startformula
> >          		A^\prime
> >          	\stopformula
> >          \stoptext
> >
> > I get the following error.
> >
> >          fonts>  fallback modern rm 12pt is loaded
> >          ! Missing { inserted.
> >
> >          system>  tex>  error on line 4 in file exponent-regression..tex: Missing { inserted ...
> >
> >          1     \starttext
> >          2     	\placeformula
> >          3     	\startformula
> >          4>>   		A^\prime
> >          5     	\stopformula
> >          6     \stoptext
> >          7
> >
> >          <to be read again>
> >                             ^
> >          \prime ...char \textfont \zerocount "FE325\relax ^
> >                                                            \bgroup \expandafter \dodo...
> >          l.4 		A^\prime
> >
> >          ?
> >
> > As a workaround `A^{\prime}` can be used.
> 
> Forget about superscripting prime .. that's a traditional tex thing as 
> in cm/lm fonts the prime is so big that it has to be (super)scripted to 
> look okay.
> 
> The prime in unicode is a normal one so that's what we now support, also 
> for the lm fonts. Just compare:
> 
> \startformula
>      A\prime
>      \hbox spread 1em{\hss or\hss}
>      A^{\prime}
>      \hbox spread 1em{\hss or\hss}
>      A'
> \stopformula
> 
> Keep in mind that most users expect ' to be a prime.

Interesting. Thank you for the clarification. I will use A' from now on
I guess.


Thanks,

Paul