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Oct
22
comment How to solve fourth order pde similar to biharmonic equation.
$\dfrac{\partial^2}{\partial x^2}u(x,y)=0$ , $\dfrac{\partial^2}{\partial y^2}u(x,y)=0$ and $\dfrac{\partial^2}{\partial x\partial y}u(x,y)=0$ are not belonging to the boundary conditions since they are already restricted the form of $u(x,y)$ should be.
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