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I have some problems using the exclamation mark symbol explicitly, so I have to find another way to print it on math mode. I tried to use \usepackage[utf8]{inputenc} but apparently I have to define a new macro and I really don't want to do that. Any advice would be great.

Edit: I have an application that generates a .tex file as output, the input is another file that I have to parse, and ! is as reserved symbol, so I can't put it explicitly.

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    what is wrong with using ! that is the normal way. – David Carlisle Feb 17 '16 at 15:40
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    Welcome to TeX.SX! Normally $n!$ works fine – egreg Feb 17 '16 at 15:42
  • Thanks. I will add more information about the reason that I can't use the symbol explicitly. – 6c656c Feb 17 '16 at 15:45
  • \newcommand*\bang{!} then $n\bang\bang$. – Manuel Feb 17 '16 at 15:51
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    @Manuel youtube.com/watch?v=T5Xl0Qry-hA – Johannes_B Feb 17 '16 at 15:54
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! is at position hex 21 so you can use ^^21 which will make a ! token just as if a ! had been in the input.

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