Dobinski-type relations and the Log-normal distribution

Details Dobinski-type relations and the Log-normal distribution Dobinski-type relations and the Log-normal distribution

2003-03-06

arxiv.org/abs/quant-ph/0303030v1

J.Phys.A:Math.Gen. 36, L273 (2003)

Physics

Quantum Physics

7 pages, 2 Figures

Scientific paper

10.1088/0305-4470/36/18/101

We consider sequences of generalized Bell numbers B(n), n=0,1,... for which there exist Dobinski-type summation formulas; that is, where B(n) is represented as an infinite sum over k of terms P(k)^n/D(k). These include the standard Bell numbers and their generalizations appearing in the normal ordering of powers of boson monomials, as well as variants of the "ordered" Bell numbers. For any such B we demonstrate that every positive integral power of B(m(n)), where m(n) is a quadratic function of n with positive integral coefficients, is the n-th moment of a positive function on the positive real axis, given by a weighted infinite sum of log-normal distributions.

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