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- W4300379916 abstract "Double Hurwitz numbers have at least four equivalent definitions. Most naturally, they count covers of the Riemann sphere by genus g curves with certain specified ramification data. This is classically equivalent to counting certain collections of permutations. More recently, double Hurwitz numbers have been expressed as a count of certain ribbon graphs, or as a weighted count of certain labeled graphs. This note is an expository account of the equivalences between these definitions, with a few novelties. In particular, we give a simple combinatorial algorithm to pass directly between the permutation and ribbon graph definitions. The two graph theoretic points of view have been used to give proofs that double Hurwitz numbers are piecewise polynomial. We use our algorithm to compare these two proofs." @default.
- W4300379916 created "2022-10-03" @default.
- W4300379916 creator A5072051772 @default.
- W4300379916 date "2013-03-06" @default.
- W4300379916 modified "2023-10-16" @default.
- W4300379916 title "Hurwitz numbers, ribbon graphs, and tropicalization" @default.
- W4300379916 doi "https://doi.org/10.48550/arxiv.1303.1543" @default.
- W4300379916 hasPublicationYear "2013" @default.
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