English

Equivalence classes of dessins d'enfants with two vertices

Number Theory 2022-09-19 v1 Algebraic Geometry Combinatorics

Abstract

Let NN be a positive integer. For any positive integer LNL\leq N and any positive divisor rr of NN, we enumerate the equivalence classes of dessins d'enfants with NN edges, LL faces and two vertices whose automorphism groups are cyclic of order rr. Further, for any non-negative integer hh, we enumerate the equivalence classes of dessins with NN edges, hh faces of degree 22 with hNh\leq N, and two vertices, whose automorphism groups are cyclic of order rr. Our arguments are essentially based upon a natural one-to-one correspondence of the equivalence classes of all dessins with NN edges to the equivalence classes of all pairs of permutations with components generating transitive subgroups of the symmetric group of degree NN.

Keywords

Cite

@article{arxiv.2209.07719,
  title  = {Equivalence classes of dessins d'enfants with two vertices},
  author = {Madoka Horie},
  journal= {arXiv preprint arXiv:2209.07719},
  year   = {2022}
}

Comments

32 pages, 2 figures