Understanding Non-Linear PDEs: Causes and Implications

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What makes a PDE non-linear please?

Thanks!
 
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Do you know what makes an ordinary diff. eq. non-linear?
 
Do you know what nonlinear means? :)
 
Having a non-linear function of the dependent function anywhere in the equation. I suspect arildno and Tide were wondering how you could be studying partial differential equations if you don't know what "non-linear" means!
 

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