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I don't know how to write over Gamma function as shown in the photo. I want to write (1) (2) (3) above the Gamma functionenter image description here

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    \overset{(1)}{\Gamma} – egreg Aug 19 at 17:46
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    @egreg, post as answer? – Ben Bolker Aug 19 at 17:56
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    Unrelated to this question, but since you have already asked several questions and recieved responses there that seem to answer your questions, please consider marking them as ‘Accepted’ by clicking on the tickmark below their vote count (see How do you accept an answer?). This shows which answer helped you most, and it assigns reputation points to the author of the answer (and to you!). It's part of this site's idea to identify good questions and answers through upvotes and acceptance of answers. – leandriis Aug 19 at 17:57
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    Closely related (possible duplicate?): Superscript directly above character – leandriis Aug 19 at 17:58
  • @leandriis I believe it is not exactly the same: in the question you linked to, the stack of two symbols is expected to behave as a \mathrel, and \stackrel is thus acceptable. I believe this is not the case here: \overset seems fine but not \stackrel. – frougon Aug 19 at 18:32
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You can use \overset, but with a small correction:

\documentclass{article}
\usepackage{amsmath}

\newcommand{\iGamma}[1]{\overset{\scriptscriptstyle(#1)}{\Gamma}}

\begin{document}

\[
\iGamma{1}
\]

\end{document}

enter image description here

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