On 11/15/2017 6:16 PM, Malte Dehling wrote:
On Wed, Nov 15, 2017 at 03:16:45PM +0100, Hans Hagen wrote:
On 11/14/2017 1:43 PM, Malte Dehling wrote:
I posted a question on tex.SE with the subject as title. In short,
there is a difference in how pdflatex and lualatex handle the expression
$\left(a\mathrel{}\middle|\mathrel{}b\right)$. Using pdflatex one gets
symmetric spacing around the vertical bar while lualatex produces more
space on the right. See here for the question and an explanation in the
answer:
https://tex.stackexchange.com/questions/401234/how-to-get-a-mid-binary-relation-that-grows-in-luatex
Is this a bug or intentional behavior?
A mixture.
(1) middle behaves like a mixture of open and close and this was swapped so
that's a bug
(2) but ... luatex provides control over the spacing and as you inject a rel
noad you get twice the spacing but you can tweak that with
\Umathopenrelspacing \textstyle0mu
\Umathcloserelspacing\textstyle0mu
Am I correct in assuming that this would have unintended side effect in
many other equations, not just spacing of \middle (and maybe \left and
\right?)
sure but then, using an empty \mathrel{} in there is kind of bad ..
better add some explicit muskip then
(3) the good news is that you can do this:
\left( a \Umiddle class 5 | b \right)
Heel erg bedankt! I'll use this since I only need to compile with
lualatex. For the record, Enrico (egreg) posted an answer to my
question on tex.se, based on your reply, which works in both pdflatex
and lualatex.
Best,
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