Double subscript issue

Question

How can I write (Jx)x∈A in LaTeX? (the second subscript is for parentheses.)

I am trying to write like this, but it's not working: (J}_x)_{x_\in_\textit{A}

Thank you!

Answer 1

Try out ${(J_x)}_{x\in A}$. It works with me.

Answer 2

Well, I will obey Barbara Beeton suggestion:

• in your code are misplaced curly braces and use of _: instead of (J}_x)_{x_\in_\textit{A} it should be `$(J_x)_{x\in\textit{A}}$ or simpler $(J_x)_{x\in A}$
• your notation is very unusual, to me is more logical $J(x\in A)$ or $J_{x}\big|_{x\in A}$ or even $J_{x\in A}$.

See examples below:

\documentclass{article}

    \usepackage[active,tightpage]{preview}
\setlength\PreviewBorder{1em}

    \begin{document}
%---------------------------------------------------------------%
    \begin{preview}
    \begin{tabular}{rl}
\verb+$(J_x)_{x\in A }$+: &    $(J_x)_{x\in A}$\\
\verb+$J(x\in A)$+:              &  $J(x\in A)$\\
\verb+$J_{x}\big|_{x\in A}$+:    &  $J_{x}\big|_{x\in A}$\\
\verb+$J_{x\in A}$+:             &  $J_{x\in A}$
    \end{tabular}
    \end{preview}
%---------------------------------------------------------------%
    \end{document}