I just begun to use lyx for days and when i was trying to input a math
equation like this(base on the IEEtrans template),

-----------------------------------------------

$f(x)=\begin{cases}
1 & x>0\\
0 & x<0\end{cases}$

------------------------------------------------

it supposed to looked like this:

http://www.nabble.com/file/p16918124/Fx.png 


after compiling i'm always getting this error:

http://www.nabble.com/file/p16918124/Error.png 


and when I copy the same equation above to a new empty Lyx file, and
unbelievablely it passed !!!
if I deleted the equation in the IEEEtrans Lyx-doc, it can also be correctly
compiled!


It means I can't write such an equation in a Lyx file that's based on a
template but must creat a new empty file to reedit and reconfigure, that's
really baffling ! (Is it a bug or sth else???)

sb could give a hand ? thx.



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