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I defined a new command \doublefaktor to print a double coset of type A\B/C (similar to \faktor which print a quotient A/B) as follows:

\newcommand{\doublefaktor}[3]{ {\textstyle #1}\mkern-8mu\diagdown\mkern-5mu^{\textstyle #2}\mkern-5mu\diagup\mkern-8mu{\textstyle #3} }

(thanks to previous suggestions here) but I would like to have bigger \diagdown and \diagup in the pdf-printing. How can I do?

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    \big doesn't take an argument (as in \big{arg.}): it is prefixed to a math delimiter, like in \big( or \big| or \big\{. Mar 16 '20 at 11:46
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    Additionally please make your sniplet into a complete example, there are several macros here we do not know the definition of, and thus we cannot test your code without guessing
    – daleif
    Mar 16 '20 at 11:49
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    And that is going to help us how? Provide the code, else others cannot test or help with your problem.
    – daleif
    Mar 16 '20 at 12:14
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    What exactly is it you are trying to do? Do you even know what \big does? Why are you attempting to apply \big to a letter? Perhaps you should start completely over. Explain what the end goal is and then perhaps someone can help you.
    – daleif
    Mar 16 '20 at 12:24
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    Your edit sill not provide MWE (Minimal Working Example, a small but complete document, which reproduce your problem), which would enable simple testing of your problem.
    – Zarko
    Mar 16 '20 at 12:55
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A pure guessing:

\documentclass{article}
\usepackage{graphicx}
\usepackage{amssymb}
\newcommand{\doublefaktor}[3]{% 
    {\textstyle #1}
    \mkern-4mu\scalebox{1.5}{$\diagdown$}\mkern-5mu^{\textstyle #2}%
    \mkern-4mu\scalebox{1.5}{$\diagup$}\mkern-5mu{\textstyle #3} }

\begin{document}
\[
\doublefaktor{A}{B}{C}
\]
\end{document}

Note, above document example is called MWE (Minimal Working Example). It gives after compilation the following result:

enter image description here

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  • Thank you so much. For future question how can I display a MWE?
    – V.Galgano
    Mar 16 '20 at 21:21
  • @V.Galgano, copy content from your LaTeX editor to question window, than put ``` before and after it. That is.
    – Zarko
    Mar 16 '20 at 21:58

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