Is this equation always verified?

[Guest Joli Le Chat]

Please, could you help me on finding if the attached equation is always verified?

 

Thank you!

[Dapthar]

Please, could you help me on finding if the attached equation is always verified?

Then the equation you posted is correct, and this can be verified by simply adding [math]\frac{\partial w(t,y)}{\partial y^2}\cdot\frac{\partial u(t,y)}{\partial y^2}[/math] to both sides of the equation you posted.