[Tex/LaTex] Spacing problem between equation and surrounding text

equationsspacing

I want to insert formula in text and I used equation as shown:

\documentclass{article}
\usepackage{amsmath}

\begin{document}

So, $\rho : G \rightarrow GL(n,\mathbb{F})$ is representation if and only if

\begin{equation*}
\forall g,h \in G) \hspace{2mm} \rho(gh)=\rho(g)\rho(h).
\end{equation*} 

\end{document}

My problem is too big vertical spacing before and after formula.

Best Answer

If you truly believe that the default values of the length parameters \abovedisplayskip and \belowdisplayskip make LaTeX insert a bit too much vertical whitespace above and below a displayed equation, you could reduce those values a bit. E.g., 

\addtolength\abovedisplayskip{-1ex}
\addtolength\belowdisplayskip{-1ex}

Don't go overboard, though.

Do also follow barbara beeton's advice not to leave blank lines above and below the code that defines the displayed equations. And, if your document loads the setspace package and uses a spacing setting other than \singlespacing, do load the package with the option nodisplayskipstretch. Doing so turns off line stretching before and after displays. If your document uses \doublespacing you'll notice a huge effect.

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