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Discrete Chebyshev polynomials
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<p>In mathematics, discrete Chebyshev polynomials, or Gram polynomials, are a type of <a href="/facts/Discrete_orthogonal_polynomials/Bk6xgzu0">discrete orthogonal polynomials</a> used in <a href="/facts/Approximation_theory/87AaPXLp">approximation theory</a>, introduced by <a href="/facts/Pafnuty_Chebyshev/LzRqLqRm">Pafnuty Chebyshev</a> and rediscovered by <a href="/facts/J%C3%B8rgen_Pedersen_Gram/r6Hodn4n">Gram</a>. They were later found to be applicable to various algebraic properties of spin angular momentum. </p>