DLMF:3.4.E25 (Q1229)

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DLMF:3.4.E25
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    2 u 0 , 0 x y = 1 4 h 2 ( u 1 , 1 - u 1 , - 1 - u - 1 , 1 + u - 1 , - 1 ) + O ( h 2 ) , subscript 𝑢 0 0 2 𝑥 𝑦 1 4 superscript 2 subscript 𝑢 1 1 subscript 𝑢 1 1 subscript 𝑢 1 1 subscript 𝑢 1 1 Big-O superscript 2 {\displaystyle{\displaystyle\frac{{\partial}^{2}u_{0,0}}{\partial x\partial y}% =\frac{1}{4h^{2}}\,(u_{1,1}-u_{1,-1}-u_{-1,1}+u_{-1,-1})+O\left(h^{2}\right),}}
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