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arxiv: 1609.05493 · v1 · pith:SP3JXOFDnew · submitted 2016-09-18 · 🧮 math.CO

Rationality in map and hypermap enumeration by genus

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keywords enumerationexplicitfunctionsgenushypermapbecomechangecoefficients
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Generating functions for a fixed genus map and hypermap enumeration become rational after a simple explicit change of variables. Their numerators are polynomials with integer coefficients that obey a differential recursion, and denominators are products of powers of explicit linear functions.

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