I'd like to redefine \big, \Big etc. commands to change their dimensions for single equations. E.g.


For practical reasons I'd like to define, in the preamble, a command like this:


so to have something like:


But it doesn't work. Where am I wrong?

  • 4
    \makeatletter/other must always be outside the macro definition. Use \makeatletter\newcommand{\mybig}[1]{\renewcommand{\big}{\bBigg@{#1}}}\makeatother. – Phelype Oleinik Feb 3 at 17:29
  • @PhelypeOleinik, Yes it does! If you post an answer to my question I will accept it. – Gabriele Nicolardi Feb 3 at 17:36
  • 2
    Sorry, the question got closed before I got to write an answer. But the answer in the linked duplicate describes exactly why your attempt didn't work (it's a fairly common mistake, I myself made it a few times ;-) – Phelype Oleinik Feb 3 at 17:55

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