# Latex error: Environment subequations undefined

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## Latex error: Environment subequations undefined

 Hello, I used "\begin{subequations}"  and "\end{subequations}" to have equations in between. It worked on my two earlier research papers using LyX 1.6 mac os snow leopard. But suddenly the same way stopped working in a new LyX file. I just can't figure it out. No clue at all. Can anyone help. Thanks.