[Tex/LaTex] Indexing of equation

indexingline-breakingnumbering

I have this code:

\documentclass{article}
\usepackage{amsmath}
\begin{document}
\begin{gather*}
  \max\nolimits_X \min\nolimits_{\vec{Y}} F(X, \vec{Y})) =
  \sup\nolimits_{X} (\inf\nolimits_{\vec{Y}} F(X, \vec{Y})) = \Gamma_1, \\
  \min\nolimits_{\vec{Y}} (\max\nolimits_X F(X, \vec{Y})) =
  \inf\nolimits_{\vec{Y}} (\sup\nolimits_{X} F(X, \vec{Y})) = \Gamma_2
\end{gather*}
\end{document}

But I want to have indexing equation. If I use \begin{equation} ...\end{equation}, I have not any break line.

Best Answer

The starred environments of amsmath such as gather*, align* and alignat* do not use equation numbers. Just say gather and the equation number will appear, unless suppressed with \nonumber

\documentclass{article}
\usepackage{amsmath}
\begin{document}
\begin{gather*}
  \max\nolimits_X \min\nolimits_{\vec{Y}} F(X, \vec{Y})) =
  \sup\nolimits_{X} (\inf\nolimits_{\vec{Y}} F(X, \vec{Y})) = \Gamma_1, \\
  \min\nolimits_{\vec{Y}} (\max\nolimits_X F(X, \vec{Y})) =
  \inf\nolimits_{\vec{Y}} (\sup\nolimits_{X} F(X, \vec{Y})) = \Gamma_2
\end{gather*}

\begin{gather}
  \max\nolimits_X \min\nolimits_{\vec{Y}} F(X, \vec{Y})) =
  \sup\nolimits_{X} (\inf\nolimits_{\vec{Y}} F(X, \vec{Y})) = \Gamma_1, \\
  \min\nolimits_{\vec{Y}} (\max\nolimits_X F(X, \vec{Y})) =
  \inf\nolimits_{\vec{Y}} (\sup\nolimits_{X} F(X, \vec{Y})) = \Gamma_2
\end{gather}

\end{document}
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