latex - How can I add delimiters around the amsmath align environment? -

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i have group of equations , i'd show under transformation, system looks else. i'd group ams align environment inside pair of brackets such align environment vertically centered on line , can like:

alt text

(that uses matrix environment, alignment centered.)

i using lyx.

\begin{equation}   \left\{     \begin{matrix}       x = &  y \\       y = & -x-\mu(x^4-1)y     \end{matrix}   \right\}    \rightarrow     \left\{      \begin{matrix}       w = & -x \\       x = & w-\mu f(x)     \end{matrix} \right\} \end{equation}

produces closely thing shown above.


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