Exact Solutions > Nonlinear Partial Differential Equations > Higher-Order Partial Differential Equations ## 6. Fourth-Order Partial Differential Equations-
*w*_{tt}+ (*w**w*_{x})_{x}+*w*_{xxxx}= 0. Boussinesq equation. -
*w*_{y}(Δ*w*)_{x}−*w*_{x}(Δ*w*)_{y}=*a*ΔΔ*w*. Equation of motion of viscous fluid; it is obtained from the Navier--Stokes equations.
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