For example, if I want to write a closure of a set, which is denoted A_1
, should I use $\overline{A_1}$
or $\overline A_1$
(or something completely different)?
For me, the more logical choice seems to be $\overline{A_1}$
(since I read \overline
command as "closure of"). But maybe from typographical point of view this can be considered differently.
Here is a MathB.in link for comparison. (I am aware that rendering in MathJax and LaTeX is not necessarily the same, but I do not know what is standard way to make images with symbols for TeX.SE posts.)
Here is also a picture which I tried to create from pdf output using the method described in this answer on meta.
I have seen that there exists a question \overline and \widehat with subscript. But that question asks about subscript added to the bar symbol, not subscript added to the symbol(s) which are under the bar.