I'm trying to write a set subtraction operation in an AMS formatted template. In the end, what I want should look like A\B. But I'm doing this in math-mode $A\B$ and this gives me errors. I've also tried using the \diagdown symbol, but it doesn't work either. Is there another way to do this?
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\setminus should be what you are after.
\documentclass{article}
\usepackage{amssymb} % for \smallsetminus
\begin{document}
\[ \mbox{setminus: } A \setminus B,\quad \mbox{smallsetminus: } A \smallsetminus B, \quad \mbox{backslash: } A \backslash B\]
\end{document}
Note that you can find more information here on How to look up a symbol?. In particular, you have the Comprehensive LaTeX symbols and the website Detexify. There is also this post which was mentioned earlier in a comment
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3You can include also
$\backslash$, which produces a different spacing, for comparison. – JLDiaz Dec 9 '12 at 18:35 -
@JLDiaz Thanks for your comment, you are right, I will update my post. – Corentin Dec 9 '12 at 18:37
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there is also
\smallsetminus, available with\usepackage{amssymb}, for those who prefer a smaller symbol (with the same meaning). – barbara beeton Dec 9 '12 at 18:38 -
\Bas a macro name (probably undefined). What about$A\backslash B$? – JLDiaz Dec 9 '12 at 18:33