On 12/27/2022 6:33 PM, Alan Braslau via ntg-context wrote:
MWE:
\starttext
$a^2′$
$a′^2$
$\mathord{a′}^2$
$a^*^2$
\stoptext
Should the \mathord{} be necessary to get the desired result?
(I would expect the second line to work, just like $a^*^2$.)
primes are kind of special and a pain in tex
- traditional tex sees them as superscripts and therefore expects soem
active character and parsing magick for successive scripts
- that assumes a special way of havign these primes in the font (read:
is it a text size thing already raised or a script one not yet raised)
- it also sort of spoils spacing (as one can end up with an empty
nucleus inserted)
- in mkiv we use different magick than in mkii
anyway, in lmtx (luametatex) primes have been promoted to first class
citizens which means that a nucleus can have
- super(post)script
- sub(post)script
- superprescript
- subprescript
- prime
and each comes with spacing and positioning properties cf opentype and
our own additions for the pre/prime)
there is some magick wrt subscripts as these often are indices (which is
why we have for instance ^^^ and ___ too)
What you can do is:
$\primed{a}^2$
which basically makes the prime an operation .. a small price to pay for
more robust handling of primes (also across fonts)
Hans
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