DLMF:1.9.E27 (Q302)

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DLMF:1.9.E27
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    Statements

    Defining formula
    ∂ 2 ⁡ u ∂ ⁡ r 2 + 1 r ⁢ ∂ ⁡ u ∂ ⁡ r + 1 r 2 ⁢ ∂ 2 ⁡ u ∂ ⁡ θ 2 = 0 partial-derivative 𝑢 𝑟 2 1 𝑟 partial-derivative 𝑢 𝑟 1 superscript 𝑟 2 partial-derivative 𝑢 𝜃 2 0 {\displaystyle{\displaystyle\frac{{\partial}^{2}u}{{\partial r}^{2}}+\frac{1}{% r}\frac{\partial u}{\partial r}+\frac{1}{r^{2}}\frac{{\partial}^{2}u}{{% \partial\theta}^{2}}=0}}
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    DLMF id
    DLMF:1.9.E27
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