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I found a lots of questions asking how to add a superscript to a variable defined with a superscript but none for how to do it the other way around.

My macro is \newcommand{\trsp}[1]{#1^T} and I want to apply it to e.g. \trsp{M^{-1}}.

How do I avoid a Double Superscript error ?

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  • the simplest way is to define \trsp as {#1}^T but that has some consequences on spacing in all cases. So alternative is to explicitly test or have a separate command for teh transposed inverse Commented Jun 7, 2021 at 7:46
  • If you want something automatic, have a look at this answer.
    – NBur
    Commented Jun 8, 2021 at 7:29

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Use \def\trsp#1{{#1}^T}. The key is to use {#1} instead #1 in the body of the macro. You can use \newcommand too, if you are using LaTeX.

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