How to label each equation in align environment?

Posted by Tim on Stack Overflow See other posts from Stack Overflow or by Tim
Published on 2010-04-08T11:58:18Z Indexed on 2010/04/08 12:03 UTC
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latex

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align

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equation

Hi,

I wonder how to label each equation in align environment? For example

\begin{align} \label{eq:lnnonspbb}
\lambda_i + \mu_i = 0 \\
\mu_i \xi_i = 0 \\
\lambda_i [y_i( w^T x_i + b) - 1 + \xi_i] = 0
\end{align}

only label the first equation and only the first equation can be referred later.

Thanks and regards!

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