Write a tensor with a bar or a tilde over it

Question

I'm trying to write a multi-index tensor with a bar or a tilde over it, usually I use:

    \usepackage{tensind}
    \tensordelimiter{?}
    \tensorformat{}

but when i write, for example:

$?\Tilde{R}_i^{jk}?$ 

the editor returns error. Could someone suggest me how to solve the issue? Thank you.

Answer 1

Use braces:

\documentclass{article}
\usepackage{amsmath}
\usepackage{tensind}

\tensordelimiter{?}
\tensorformat{}

\begin{document}

$?R_i^{jk}?$

$?{\tilde{R}}_i^{jk}?$

\end{document}

Note that \Tilde is provided by amsmath, but it just does the same thing as \tilde (it exists for back compatibility).

You get the same output with tensor:

\documentclass{article}
\usepackage{amsmath}
\usepackage{tensor}

\begin{document}

$\tensor{R}{_i^{jk}}$

$\tensor{\tilde{R}}{_i^{jk}}$

\end{document}