0

In the example:

\documentclass[12pt,a4paper]{article}
\usepackage[fleqn]{amsmath}
\usepackage{enumitem}

\begin{document}
\begin{enumerate}[label=(\roman*)]
\item $N_H(P)$ is a subgroup of G
\item $N_H(P) \cap P \Delta N_H(P)$
\item 
\begin{equation*} 
{\setlength{\mathindent}{0cm}
\frac{N_H(P) P}{P} \cong \frac{N_H(P)}{ N_H(P) \cap P}
}
\end{equation*}
\end{enumerate}

\end{document}

The last item has too much vertical space, how to remove it? I've tried various combinations of gather, abovedisplayskip etc. If there is a better way to do this I'd appreciate that. The block is standalone free text, not in any theorem etc.

1

As you are in a list I would do as you did for the first two and use inline math.

enter image description here

\documentclass[12pt,a4paper]{article}
\usepackage[fleqn]{amsmath}
\usepackage{enumitem}

\begin{document}
\begin{enumerate}[label=(\roman*)]
\item $\displaystyle 
N_H(P)$ is a subgroup of $\displaystyle  G$
\item $\displaystyle 
N_H(P) \cap P \Delta N_H(P)
$
\item $\displaystyle 
\frac{N_H(P) P}{P} \cong \frac{N_H(P)}{ N_H(P) \cap P}
$
\end{enumerate}

\end{document}

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