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I am getting the following error

missing \endgroup inserted

\begin{lstlisting}[mathescape]
 K$_{i}$ = $\displaystyle \frac{$\delta$}{max $\delta$} $
\end{lstlisting} 

I just use the package listings

  • 2
    Why do you do a $ within the arguments of \frac? Those are already in math mode. – TeXnician Jun 2 '17 at 15:02
  • why are you using listings here? your $ are clearly in the wrong place the second math escape is $\displaystyle \frac{$ with just the start of the fraction. – David Carlisle Jun 2 '17 at 15:02
  • @user3319015 What is the intended output? – user36296 Jun 2 '17 at 15:10
  • I am new to using \listings. After removing the $ near \delta, I get the desired result. @David Carlisle,@samcarter: I am using \listing to avoid equation numbers, and I am using it to show a snippet of pseudocode used in a different research paper. Thank You very much for your help – user3319015 Jun 3 '17 at 8:58
  • "using listings to avoid equation numbers"????????????????????? that is so weird. Every latex environment that adds an equation number has a version that does not add a number. here don't you just want \[K_{i}= \frac{\delta}{\max \delta} \] ??? – David Carlisle Jun 3 '17 at 9:14
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listings is for syntax highlighting computer program code, using it for mathematics is painful to enter and will produce weirdly typeset output.

You just seem to want an unnumbered math display so

\[K_{i}= \frac{\delta}{\max \delta} \]

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