On 11/14/2017 1:43 PM, Malte Dehling wrote:
Hi everyone,
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
(3) the good news is that you can do this:
\left( a \Umiddle class 5 | b \right)
Hans
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