Re: [NTG-context] Second derivative ''

5 Mar 2020

      On 3/5/2020 5:41 PM, Mikael P. Sundqvist wrote:
...
On Thu, Mar 5, 2020 at 5:36 PM Aditya Mahajan mailto:adityam@umich.edu> wrote:
On Thu, 5 Mar 2020, Hans Hagen wrote:
> On 3/4/2020 11:44 PM, Weber, Matthias wrote:
     >> Dear List,
     >>
     >> \starttext
     >> \startformula
     >> \left(f\right)'' = f''
     >> \stopformula
     >> \stoptext
     >>
     >> has the second apostrophe set too low. This is in MKIV on
    ConTeXt live as
     > well as in my slightly older version.
     >> What is the “right” way to typeset a second derivative?
     > you have to turn on
     >
     > \setupmathematics
     >   [collapsing=3]
     >
     > but it has the side effect of also collapsing more:
     >
     > $x'' >= 10$
     >
     > (which is why the mechanism is currently turned off by default)
     >
     > i'll think about an option that only does some specific ones only
     >
     > (btw, i love tex but these primes are a bit painful due to th
    eorriginal
     > approach which has lead mixtures of (1) raised in the font and/or
    raised
     > in the engine, (2) them being superscripts but not really, (3) fonts
     > therefore doing it inconsistently, (4) some parsing related to
    multiple
     > scripts, (5) double, tripple, etc primes being real unicode
    characters
     > but spaced singles in traditional tex (which itself then
    introduces some
     > size juggling) ... i could proabbly write a few pages about it)
So what's the best way to input them: using \prime, \prime\prime, etc.?
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And what is the way if one also want indices:
$f''_{xx}$ or $f_{xx}''$ or ... ?
I want the indices under the primes
did you try with

\setupmathematics
   [collapsing=1]

both work but (i'm no mathematician) i'd opt for

$f_{xx}''$

as it says take the second something from f_{whatever} unless of course 
the index applies the second something

But i bet that Aditya can give the real answer.

Hans

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