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The dual of a formula of Viskov

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Abstract

This minipaper offers a formula which is dual to that ofViskov cite{vis}. While Viskov's can be thought ofas a rising formula for Laguerre polynomials, ours is preciselythe lowering one. Besides documenting the formula, which seems tobe missing, we want to provide a (rather elementary) operatortheory argument instead of making crude calculations. In otherwords, the annihilation and creation operators areconfronted with lowering and rising {it formulae}; they are oftenfailed to be distinguished.

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