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I need some notation for a matrix M which indicates that row r and column c is excluded. I tried

M_{(r,c)^-}

but the minus sign is too low and not close enough for this to be good notation.

\documentclass{article}
\usepackage{amsmath}

\begin{document}

\[
M_{(r,c)^-}
\]

\end{document}

enter image description here

Here are some proposals which I don't know how to do in LaTeX:

  • Move the minus sign to be a little higher and closer to the close bracket and maybe a little smaller.
  • Forget the minus sign but use a bracket which is not (), [] or {}.
  • 1
    Note that MathJax is not enabled on the site. I added some minimal code and the result. I'm not sure what your problem is. – egreg Apr 25 '17 at 10:27
  • @egreg Thank you. I just don't like the notation in the end. I was hoping for suggestions. – Lembik Apr 25 '17 at 10:56
  • I'm afraid that as posed the question is off-topic. It can become a good question if you make some proposals and ask about how to realize them with LaTeX. – egreg Apr 25 '17 at 11:10
  • @egreg Understood. I added some specific questions of this sort. – Lembik Apr 25 '17 at 11:26
3

There are various ways to modify the position of the superscript. From {(x+y)}^2 or (x+y)^2?, Horizontal placement of subscript/superscript, How to raise a subscript?:

\documentclass{article}

\begin{document}
$M_{(r,c)^-}$
$M_{{(r,c)}^-}$       % lowers the subscript
$M_{{(r,c)}^{\!-}}$   % horizontal position
$M_{(r,c)}${\raisebox{0.5pt}{${}^{\!\!\!-}$}}  % vertical position
\end{document}

enter image description here

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