 The standardization formula_6 fixes the normalization of the Legendre polynomials
(with respect to the norm on the interval ).Since they are also orthogonal with respect to the same norm, the two statements can be combined into the single equation,

(where denotes the Kronecker delta, equal to 1 if and to 0 otherwise).This normalization is most readily found by employing Rodrigues' formula, given below.