Formula:1207

Digital Library of Mathematical Functions ID 3.4.E32

${\displaystyle{\displaystyle\nabla^{4}u=\frac{{\partial}^{4}u}{{\partial x}^{4}}+2\frac{{\partial}^{4}u}{{\partial}^{2}x{\partial}^{2}y}+\frac{{\partial}^{4}u}{{\partial y}^{4}}\,.}}$

Symbols List

• ${\displaystyle{\displaystyle\frac{\partial\NVar{f}}{\partial\NVar{x}}}}$: partial derivative of $$f$$ with respect to $$x$$
• ${\displaystyle{\displaystyle\partial\NVar{x}}}$: partial differential of $$x$$
• ${\displaystyle{\displaystyle u}}$: function
 

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