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List: lyx-devel
Subject: Re: Primes and superscripts in mathed
From: Andrew Parsloe <ajparsloe () gmail ! com>
Date: 2023-11-27 22:15:29
Message-ID: 813f31f4-8eab-47d1-aabf-7e962c813fba () gmail ! com
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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-bounces@lists.lyx.org> on behalf of
> Andrew Parsloe <ajparsloe@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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<div class="moz-cite-prefix">On 27/11/2023 6:02 pm, Isaac Oscar
Gariano wrote:<br>
</div>
<blockquote type="cite"
cite="mid:SY7P282MB38980365E9F914833A540D778CBDA@SY7P282MB3898.AUSP282.PROD.OUTLOOK.COM">
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<style type="text/css" style="display:none;">P \
{margin-top:0;margin-bottom:0;}</style> <div class="elementToProof"
style="font-family: "Segoe UI", "Segoe UI Web (West European)", \
"Helvetica Neue", sans-serif; font-size: 11pt; color: rgb(0, 0, 0);"> \
Personally, I just don't use the <code>'</code> in LyX at all, especially as it \
doesn't display correctly, and as you show, doesn't combine properly with other \
superscripts/subscripts.</div> <div class="elementToProof"
style="font-family: "Segoe UI", "Segoe UI Web (West European)", \
"Helvetica Neue", sans-serif; font-size: 11pt; color: rgb(0, 0, 0);"> \
Instead, I always do <code>^\prime</code> which looks much nicer, and lets you \
control things better.<br> <br>
So perhaps the code would work better if it just made <code>'</code>
autocorrect to <code>^\prime</code> ?<br>
<br>
(In fact I've defined my own <code>\pri</code> command which
alters the LaTeX height of the
<code>\prime</code> to one I like more; and ones that use the \
<code>unicode-math</code> multi-prime commands
<code>\dprime</code>, <code>\tprime</code>, and \
<code>\qprime</code>).</div> </blockquote>
<p>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).</p>
<p><br>
</p>
<p>Andrew<br>
</p>
<blockquote type="cite"
cite="mid:SY7P282MB38980365E9F914833A540D778CBDA@SY7P282MB3898.AUSP282.PROD.OUTLOOK.COM">
<div class="elementToProof"
style="font-family: "Segoe UI", "Segoe UI Web (West European)", \
"Helvetica Neue", sans-serif; font-size: 11pt; color: rgb(0, 0, 0);"> <br>
</div>
<div id="Signature">
<div><span
style="font-family: "Segoe UI", "Segoe UI Web (West European)", \
"Helvetica Neue", sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">— \
Isaac Oscar Gariano </span></div>
</div>
<hr style="display:inline-block;width:98%" tabindex="-1">
<div id="divRplyFwdMsg" dir="ltr"><font style="font-size:11pt"
face="Calibri, sans-serif" color="#000000"><b>From:</b>
lyx-devel <a class="moz-txt-link-rfc2396E" \
href="mailto:lyx-devel-bounces@lists.lyx.org"><lyx-devel-bounces@lists.lyx.org></a> \
on behalf of
Andrew Parsloe <a class="moz-txt-link-rfc2396E" \
href="mailto:ajparsloe@gmail.com"><ajparsloe@gmail.com></a><br> <b>Sent:</b> \
Monday, 27 November 2023 10:10 AM<br>
<b>To:</b> LyX Developers <a class="moz-txt-link-rfc2396E" \
href="mailto:lyx-devel@lists.lyx.org"><lyx-devel@lists.lyx.org></a><br> \
<b>Subject:</b> Primes and superscripts in mathed</font> <div> </div>
</div>
<div>
<p>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)<br>
</p>
<p> S'^{\,-1}_{0i} or S_{0i}'^{\,-1}<br>
</p>
<p>These compile fine in TeX and display as desired but mathed
turns them into<br>
</p>
<p> S'{}_{0i}^{\,-1} and S_{0i}'{}^{\,-1}</p>
<p>which give very different and clearly wrong results in the
pdf. </p>
<p>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 ^. </p>
<p>[[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.]]</p>
<p>Andrew<br>
</p>
<p>
<style>div.x_standard
{margin-bottom:2ex}</style></p>
</div>
</blockquote>
</body>
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