Discrete Chebyshev polynomials
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Not to be confused with Chebyshev polynomials.
In mathematics, discrete Chebyshev polynomials, or Gram polynomials, are a type of discrete orthogonal polynomials used in approximation theory, introduced by Pafnuty Chebyshev[1] and rediscovered by Gram.[2] They were later found to be applicable to various algebraic properties of spin angular momentum.