Hi Mikael, Indeed your observation is correct, but using \over instead of \frac yields the correct behavior. Please try the following sample:
%%% begin derivatives-prime-4.tex
\setupbodyfont[lucidaot]
\starttext
Compare the position of the prime sign in $f'/g$ in these two expressions: the
first one using \type{{... \over ...}}
\startformula
\left({f \over g}\right)' = {f' \over g} - {f \over g^2}g'
\stopformula
(which yields a correct position of the prime for $f'$ in $f'/g$), and the
second using \type{\frac{...}{...}}
\startformula
\left(\frac{f}{g} \right)' = \frac{f'}{g} - \frac{f}{g^2} g'
\stopformula
which yields a prime sign for $f'$ a little bit lower.
\stoptext
%%% end derivatives-prime-4.tex
derivatives-prime-4.pdf
Description: Adobe PDF document
> On 4 Jun 2017, at 19:42, Mikael P. Sundqvist <mic...@gmail.com> wrote:
> […]
>
> I hate to bring this up again, but look at the attached output of
>
> %%%
> %\setupbodyfont[lucidaot]
>
> \starttext
> \startformula
> f'(0)=2\frac{f'(0)}{2}
> \stopformula
> \stoptext
> %%%
>
> The prime in the fraction is in my opinion too low (it is more clear
> in the example with lucida).
>
> /Mikael
> <ctx-listexample33.pdf><ctx-listexample33-lucida.pdf>___________________________________________________________________________________
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