Lagrange's formula

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Lagrange's formula

[lə′grān·jəz ‚fȯr·myə·lə]
(mathematics)
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In this paper we present a spectral method based on the improved Lagrange formula to compute European, digital, and butterfly spread options.
With slight modifications, the Lagrange formula is indeed of great practical use.
Of course, it is generally not possible to change the order of the signs lim and [SIGMA] to end in the classic (Waring) Lagrange formula.