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# Equation formatting and numbering

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LaTeX has useful environments for multi-line equations, equation grouping, and alignment. Here are a few examples involving split, multiline, gather and align.

[To see the LaTeX code of any equation, click 'Show TeX' button above.]

Equation:

\begin{equation}
E = mc^2
\end{equation}

Equation*:

\begin{equation*}
E = mc^2
\end{equation*}

Brackets:

$E = mc^2$

Brackets tagged:

$E = mc^2\tag{x}$

Split:

\begin{equation}
\begin{split}
a& =b+c-d\\
& =g+h\\
& =i
\end{split}
\end{equation}

Multline:

\begin{multline}
a+b+c+d+e+f+g\\
M+N+O+P+Q\\
R+S+T\\
u+v+w+x+y+z
\end{multline}

Multline*:

\begin{multline*}
a+b+c+d+e+f+g\\
M+N+O+P+Q\\
R+S+T\\
u+v+w+x+y+z
\end{multline*}

Gather:

\begin{gather}
a_1=b_1+c_1\\
a_2=b_2+c_2-d_2+e_2
\end{gather}

Gather*:

\begin{gather*}
a_1=b_1+c_1\\
a_2=b_2+c_2-d_2+e_2
\end{gather*}

Align:

\begin{align}
a_1& =b_1+c_1\\
a_2& =b_2+c_2-d_2+e_2
\end{align}

Align*:

\begin{align*}
a_1& =b_1+c_1\\
a_2& =b_2+c_2-d_2+e_2
\end{align*}

Align:

\begin{align}
a_{11}& =b_{11}& a_{12}& =b_{12}\\
a_{21}& =b_{21}& a_{22}& =b_{22}+c_{22}
\end{align}

Align with \notag and \tag:

\begin{align}
a_{11}& =b_{11}& a_{12}& =b_{12}\notag\\
a_{21}& =b_{21}& a_{22}& =b_{22}+c_{22} \tag{y}
\end{align}

Align* with \tag:

\begin{align*}
a_1& =b_1+c_1\tag{z}\\
a_2& =b_2+c_2-d_2+e_2
\end{align*}

Eqnarray

\begin{eqnarray}\begin{array}{ll}\theta(x)=0&x<0\\\theta(x)=1&x>0\end{array}\end{eqnarray}

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