Explicit computation of some families of Hurwitz numbers |
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Institution: | Dipartimento di Matematica, Università di Pisa, Largo Bruno Pontecorvo, 5, 56127 PISA, Italy |
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Abstract: | We compute the number of (weak) equivalence classes of branched covers from a surface of genus to the sphere, with 3 branching points, degree , and local degrees over the branching points of the form , , , for several values of and . We obtain explicit formulae of arithmetic nature in terms of the local degrees . Our proofs employ a combinatorial method based on Grothendieck’s dessins d’enfant. |
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