amsmathmath-modemath-operators
I wish to write T in the subscript of \rho as
\rho_{\raisebox{-2pt}{\tiny T}}
But the desired case is: writing the T in the format of \mathcal. When I write
\rho_{\raisebox{-2pt}{\tiny \mathcal{T}}}
TeXStudio does not render it in a correct way!
How can I reach this goal?
You can put {\raisebox{2pt}{$\scriptstyle-$}} in the subscript. You may need to play with \mathchoice if you want a solution that will work in subsubscripts as well.
Edit: Or better yet, \mathpalette:
\makeatletter
\newcommand{\raisemath}[1]{\mathpalette{\raisem@th{#1}}}
\newcommand{\raisem@th}[3]{\raisebox{#1}{$#2#3$}}
\makeatother
and use $\Pi_{\raisemath{2pt}{-}}$.
I'm not convinced this is a good idea but you could do something like
\documentclass{article}
\usepackage{amsmath}
\renewcommand\sb[1]{_\text{$#1$}}
\begin{document}
\[
\sum_{i = 1}^{n} a_{i}
\]
\[
\sum\sb{i = 1}^{n} a_{i}
\]
\end{document}
Here I've redefined the standard command \sb which by default does the same as _, you could go further and redefine _ but history shows that if you do that usually you end up breaking something.
Best Answer
The argument of
\raiseboxis considered text mode, you have to put$ $around\mathcal{T}