Create rotated prime symbol

Question

I would prefer to work with a prime symbol that is less rotated. I tried the following

\usepackage[figuresright]{rotating}
\newcommand*{\p}{\turnbox{12}{$\,'$}\;}

which is visually what I desire. If I now write something like

$a+b\p$

things work fine, but when I use \p in subscript contexts

$a_{c\p,d}+b\p$

the symbol is not scaled and not placed right. Of course one can always work with hacks such as

$a_c\turnbox{12}{${}_{'}$}_{,d}+b\p$

but perhaps anyone knows of a simple solution?

Answer 1

You can use \mathchoice to adjust the size depending on the math context as follows:

References:

• For more details on \mathchoice see Is there a test for the different styles inside maths mode?, and Proper use of \mathchoice.

Code:

\documentclass{article}
\usepackage[figuresright]{rotating}
\newcommand*{\p}{%
    \mathchoice%
        {\turnbox{12}{$\displaystyle,'$};}%
        {\turnbox{12}{$\textstyle,'$};}%
        {\turnbox{12}{$\scriptstyle,'$};}%
        {\turnbox{12}{$\scriptscriptstyle,'$};}%
}%
\begin{document}
$a+b\p$
$a_{c\p,d}+b\p$
\end{document}