# 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.
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• Latex error: Environment subequations undefined HL2050