I would like to use the command, $\sideset{_\sigma}{_f}\times$ without an error message. This command renders the way I want it to, (a times with a left subscript of \sigma, and a right subscript of f).

My issue however is that I would like to compile through this error without have to skip it. So my question is can I put a command on that line that will compile though just that line, while being able to troubleshoot around it. In particular I would like to skip a particular error. If not this, is their some other way I might be able to typeset this.


Here is the code:

\usepackage{amsmath,amssymb,amsfonts, xypic, mathrsfs, graphicx}


Here is the error message:

./test2.tex:7:Limit controlsmust follow a math operator.

< argument > \times \nolimits


  • 1
    Welcome to TeX.sx! Please add a minimal working example (MWE) that illustrates your problem. What is the error message? We need to know that so that others can try to reproduce the problem and debug it. Aug 18, 2012 at 22:01
  • you can use $\sideset{{}_\sigma}{{}_f}{\mathop{\times}}$ but egreg's answer is the way to go.
    – percusse
    Aug 18, 2012 at 22:07
  • Is the edit that I made the right kind of thing? Aug 18, 2012 at 22:25
  • Welcome to TeX.sx! A tip: If you indent lines by 4 spaces, they'll be marked as a code sample. You can also highlight the code and click the "code" button (with "{}" on it).
    – percusse
    Aug 18, 2012 at 22:34

2 Answers 2


\sideset wants as its third argument an operator such as \sum; you get what you want by

  • See also this summary of solutions Left and right subscript Aug 19, 2012 at 7:09
  • @AndrewSwann Here the "binary operation" nature of \times must be preserved, which isn't with \prescript.
    – egreg
    Aug 19, 2012 at 10:30
  • I was thinking of two things: (1) the different range of possible commands listed there; (2) the vertical placing in the presence of a superscript on one side but not the other. It is good to note that any of them can be put inside \mathbin to make them into a binary operator, so e.g. one can write \( a \mathbin{\prescript{}{f}{\times}^N_f} b \) Aug 19, 2012 at 17:43
  • @AndrewSwann The problem is that \prescript assumes the presence of a superscript, even if empty; so to get the symbol at the same height on both sides you have to supply an empty superscript: \prescript{}{\sigma}{\times}^{}_f. I'd prefer not using \prescript.
    – egreg
    Aug 19, 2012 at 21:13

I didn't understand wat you want well but the sideset command should be in this format:

\sideset{_{left below} ^{left top}} {_{right below} ^{right top}} {a math operator like \sum}

Be successful.

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