On 27/11/2023 6:02 pm, Isaac Oscar Gariano wrote:
Personally, I just don't use the |'| in LyX at all, especially as it
doesn't display correctly, and as you show, doesn't combine properly
with other superscripts/subscripts.
Instead, I always do |^\prime| which looks much nicer, and lets you
control things better.
So perhaps the code would work better if it just made |'| autocorrect
to |^\prime| ?
(In fact I've defined my own |\pri| command which alters the LaTeX
height of the |\prime| to one I like more; and ones that use the
|unicode-math| multi-prime commands |\dprime|, |\tprime|, and
|\qprime|).
I was unaware of the command \prime until looking up the TeXbook for my
email. I've also now made a shortcut that does what I want. Thank you
(but I still think LyX should handle the combination '^ better).
Andrew
— Isaac Oscar Gariano
------------------------------------------------------------------------
*From:* lyx-devel <lyx-devel-boun...@lists.lyx.org> on behalf of
Andrew Parsloe <ajpars...@gmail.com>
*Sent:* Monday, 27 November 2023 10:10 AM
*To:* LyX Developers <lyx-devel@lists.lyx.org>
*Subject:* Primes and superscripts in mathed
TeX accepts S'^{2} (between $ delimiters) as a valid construction
(TeXbook, p.130, line above Ex. 16.5) but mathed in LyX converts this
to S'{}^{2}. In this simple case that is not a problem (in fact the
interpolated {} gives better spacing) but it becomes a problem with
expressions like (real-life example)
S'^{\,-1}_{0i} or S_{0i}'^{\,-1}
These compile fine in TeX and display as desired but mathed turns them
into
S'{}_{0i}^{\,-1} and S_{0i}'{}^{\,-1}
which give very different and clearly wrong results in the pdf.
The combination of a prime followed by a superscript seems a
sufficiently basic sequence to me that I think mathed should handle it
with more finesse than immediately and always inserting an empty brace
pair between ' and ^.
[[Speculation: I don't know the code but perhaps the problem is that
mathed insists on subscript preceding superscript when both are
involved in a symbol? R^{ij}_{kl} in mathed becomes R_{kl}^{ij}, and
inserting a prime as in R'_{kl}^{ij} then produces the double
superscript error. In contrast, R_{kl}'^{ij} does not. TeX accepts the
'^ combination and I think mathed should do so too.]]
Andrew
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