Enumeration of almost polynomial rational functions with given critical values

Details Enumeration of almost polynomial rational functions with given critical values Enumeration of almost polynomial rational functions with given critical values

2005-04-29

arxiv.org/abs/math/0504588v1

Mathematics

Combinatorics

12 pages, 3 figures

Scientific paper

Enumerating ramified coverings of the sphere with fixed ramification types is a well-known problem first considered by A. Hurwitz. Up to now, explicit solutions have been obtained only for some families of ramified coverings, for instant, those realized by polynomials in one complex variable. In this paper we obtain an explicit answer for a large new family of coverings, namely, the coverings realized by simple almost polynomials, defined below. Unlike most other results in the field, our formula is obtained by elementary methods.

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