Equations with automatic AMS numbering
This example show automatic equation numbering using the AMS
numbering style (where certain environments get numbers, sometimes one
per environment, other times, one for every line, and starred
environments don't get numbers. Use the "Show Source" button at the
bottom to see the TeX that produced it.
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\\
& \quad +e-f\\
& =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*}