latex数学公式序号

如何在LaTeX中设置数学公式的序号
为了使数学公式带有自动编号，在equation环境中输入公式即可实现这一功能[^1]。
\documentclass[12pt, letterpaper]{article}
\usepackage{amsmath}

\begin{document}

The famous Einstein's mass-energy equivalence formula can be presented with automatic numbering:

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

This demonstrates how equations are numbered automatically when placed within the equation environment.

If one wishes to customize the appearance or behavior of these numbers further, packages like `amsmath` offer additional environments such as align which also support labeling multiple lines of mathematics while providing more control over alignment and spacing between elements.

For cases where manual intervention is required—for instance, removing the number from certain equations—the `\nonumber` command may precede the end of an unnumbered line inside multi-line structures provided by amsmath package:

\begin{align}
a &= b+c \nonumber \\
d &= e+f
\end{align}

Moreover, individual labels for cross-referencing purposes can be added through the use of the `\label{}` directive followed later on by referencing it via `\ref{}` or preferably `\eqref{}`, ensuring proper formatting around parentheses surrounding reference identifiers.
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