The polynomial of degree n, which interpolates n + 1 evenly spaced data points (x0,y0), (x1,y1),…, (xn,yn), where xk = x0 + kh, is given by
where ∆y0=y1−y0, ∆2y0=∆y1−∆y0, etc. which are obtained by constructing a forward difference table.
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