DLMF:3.11.E39 (Q1487)

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DLMF:3.11.E39
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    a k = 1 n j = 0 n - 1 f j ϕ k ( x j ) ¯ , subscript 𝑎 𝑘 1 𝑛 superscript subscript 𝑗 0 𝑛 1 subscript 𝑓 𝑗 subscript italic-ϕ 𝑘 subscript 𝑥 𝑗 {\displaystyle{\displaystyle a_{k}=\frac{1}{n}\sum_{j=0}^{n-1}f_{j}\overline{% \phi_{k}(x_{j})},}}
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    k = 0 , 1 , , n - 1 𝑘 0 1 𝑛 1 {\displaystyle{\displaystyle k=0,1,\dots,n-1}}
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