# [luatex] How to get a \mid binary relation that grows in LuaTeX

Malte Dehling malte.dehling at uni-goettingen.de
Tue Nov 14 13:43:13 CET 2017

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

https://tex.stackexchange.com/questions/401234/how-to-get-a-mid-binary-relation-that-grows-in-luatex

Is this a bug or intentional behavior?

Best wishes,

--
Malte Dehling
<malte.dehling at uni-goettingen.de>