HL2050 wrote
>
> 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.
>
You just have to *uncheck* the box "Use AMS math package automatically" and
then check "Use AMS math package" in Document -> Settings... -> Math
Options. Then Apply. Worked for me in LyX 2.0.3 with "article (SPIE
Proceedings)" Document Class.
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