I am new to LaTeX and have been trying to redefine the \left( command to become \(. for some reason TeXmaker won't let me do this, it keeps telling me that \( is already defined but then when I type \( in math mode it has a fit. What should I do?

Here is my preamble:


 \usepackage[utf8]{inputenc} % input encoding UTF-8



 \newcommand{\D}{\partial} %partial operator
  • 2
    I suggest you not to redefine \left. Use the Find/Replace technique.
    – Sigur
    Mar 23, 2014 at 17:45
  • You certainly do not want to redefine \left( by \(; the former can only occur in math mode, whereas the latter marks the start of inline math mode. Did you mean ( instead?
    – jub0bs
    Mar 23, 2014 at 17:49
  • I basically want to be able to get a \left( by typing something short. \( seemed like the natural choice. @Sigur good suggestion, thanks.
    – user27182
    Mar 23, 2014 at 18:14
  • @user27182, \( \) is the same as $ $, it is the way to change from text mode to math mode.
    – Sigur
    Mar 23, 2014 at 18:21
  • 1
    @Sigur Almost the same :)
    – jub0bs
    Mar 23, 2014 at 18:38

1 Answer 1


You can overwrite LaTeX's internal definitions easily enough. It really isn't a good idea, though.

\( \frac{a}{b} \)

It would be better to use something like \lp and \rp.

\lp \frac{a}{b} \rp

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