Discrete Bessel and Mathieu functions are introduced as N-point Fourier-sum approximants to the continuous special functions via separation of variables under discrete dihedral symmetry.
Miller Jr., Symmetry and Separation of Variables , Encyclopedia of Mathematics, Vol
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Discrete Bessel and Mathieu functions
Discrete Bessel and Mathieu functions are introduced as N-point Fourier-sum approximants to the continuous special functions via separation of variables under discrete dihedral symmetry.