DLMF:1.5.E13 (Q132)

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Language	Label	Description	Also known as
English	DLMF:1.5.E13	No description defined

Statements

{\displaystyle{\displaystyle\nabla^{2}f=\frac{{\partial}^{2}f}{{\partial x}^{2% }}+\frac{{\partial}^{2}f}{{\partial y}^{2}}=\frac{{\partial}^{2}f}{{\partial r% }^{2}}+\frac{1}{r}\frac{\partial f}{\partial r}+\frac{1}{r^{2}}\frac{{\partial% }^{2}f}{{\partial\phi}^{2}}.}}

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DLMF:1.5.E13

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