Legendre polynomials P_i on (-1,1), up to order n --> n+1 values
Legendre polynomials P_i on (-1,1), up to order n --> n+1 valuesl P_l = (2 l - 1) x P_{l-1} - (l-1) P_{l-2}
P_0 = 1 P_1 = x P_2 = -1/2 + 3/2 x^2
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