Hi, How do I represent the 2nd term in the RHS of the following dimensionlessPDE? I've tried a couple of approaches but none worked.
\frac{\partial \phi}{\partial t} = (1 +b \phi) \frac{\partial^2 \phi}{\partial
x^2}
+ ( \frac{\partial \phi}{\partial x^2} )^2
Thanks,
Fausto
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