I have been attempting to typeset tensors using the tensor package and have come across an error when attempting to create subscripts on the subscripts of my tensors.
An example of this would be the following:
\documentclass{report}
\usepackage{mathtools}
\usepackage{tensor}
\begin{document}
\begin{equation} \label{tensor-symmetrize}
T\indices{_{(\mu_1 \mu_2 \cdots \mu_n)}_\rho^\sigma} = \frac{1}{n!} (T \indices{_{\mu_1}_{\mu_2}}_{\cdots}_{\mu_n}_\rho^\sigma
+ \text{sum over permutations of indices}) .
\end{equation}
\end{document}
On compiling this document I get an error saying
! Double subscript.
l.8 ...frac{1}{n!} (T \indices{_{\mu_1}_{\mu_2}}_
{\cdots}_{\mu_n}_\rho^\sig...