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I can't make this expression

enter image description here

Anyone can help me to make this expression?

  • Welcome to TeX.SX! I normally use $S/I$. I have never seen anyone use a "large" /, and I would advise against it. This said, if you really want this then you could use something like \newcommand\Quot{{\mathop{\mbox{\large/}}}} after which you could write $S\Quot I$. – user30471 Nov 29 '18 at 4:46
  • This is similar to How do I typeset arbitrary fractions like the standard symbol for .5 = ½? and is probably independent of the fact that this points to some mathematical notation. – Werner Nov 29 '18 at 4:46
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    MS Word also has this kind of large / (sometimes I like that :)). – manooooh Nov 29 '18 at 5:02
  • Don't; I've never seen an algebra paper or book using that; the plain $R/I$ is what's generally used. – egreg Nov 29 '18 at 10:07
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There exists a dedicated package (requires amssymb):

\documentclass{article}
\usepackage{amssymb} 
\usepackage{faktor} %

\begin{document} 

This is a typical factor ring: $\faktor{S}{I}$. 

\end{document} 

enter image description here

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