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.
McLachlan, Theory and Application of Mathieu Functions(Oxford University Press, 1947)
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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.