Spectral representations of characteristic functions of discrete probability laws

We consider discrete probability laws on the real line, whose characteristic functions are separated from zero. This class includes arbitrary discrete infinitely divisible laws and lattice probability laws, whose characteristic functions have no zeroes on the real line. We show that characteristic functions of such laws admit spectral Lévy–Khinchine type representation with non-monotonic Lévy spectral function. We also apply the representations of such laws to obtain limit and compactness theorems with convergence in variation to probability laws from this class.

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