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The subequations environment provided by AMS-LaTeX changes the numbering style of the equations inside it to (4.9a) (4.9b) (4.9c) etc. if the preceding numbered equation was (4.8).

Example[]

\begin{subequations}\label{lorenz}
	\begin{align}
		\dot x &= \sigma(y-x)   \label{l1} \\
		\dot y &= x(\rho-z) - y \label{l2} \\
		\dot z &= xy - \beta z  \label{l3}
	\end{align}
\end{subequations}

Other numbering schemes[]

Using standard LaTeX commands for counters, you can redefine \theequation to use Roman numerals:

\renewcommand{\theequation}{\theparentequation \roman{equation}}

Preamble[]

To use subequations, import the amsmath package with \usepackage{amsmath} in your preamble.

See also[]

  • \eqref (for making cross-references to equations)
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