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Integral factorial ratios: Irreducible examples with height larger than 1

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arxiv 1906.06413 v1 pith:C4GHEDAJ submitted 2019-06-14 math.NT

Integral factorial ratios: Irreducible examples with height larger than 1

classification math.NT
keywords factorialheightratiosexamplesintegralirreducibleapartarise
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This paper discusses examples of integral factorial ratios of height 2 or more. It classifies (apart from finitely many examples) such factorial ratios with height 2 and norm at most 1/3, and describes a general result which exhibits more than 50 two parameter families of integral factorial ratios with height 2. These examples are shown to be irreducible in the sense that they do not arise from multiplying two factorial ratios of height 1.

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    Gives partition-based formulae for counting s-collisions and related events in the birthday problem.