DLMF:3.11.E37 (Q1485)

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DLMF:3.11.E37
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    j = 0 n - 1 ϕ k ( x j ) ϕ ( x j ) ¯ = n δ k , , superscript subscript 𝑗 0 𝑛 1 subscript italic-ϕ 𝑘 subscript 𝑥 𝑗 subscript italic-ϕ subscript 𝑥 𝑗 𝑛 Kronecker 𝑘 {\displaystyle{\displaystyle\sum_{j=0}^{n-1}\phi_{k}(x_{j})\overline{\phi_{% \ell}(x_{j})}=n\delta_{k,\ell},}}
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