English

On finite quotients of surface braid groups having order at most $127$

Group Theory 2026-03-03 v2 Algebraic Geometry Geometric Topology

Abstract

Let Σb\Sigma_b be a compact Riemann surface of genus b2b \geq 2 and let P2(Σb)=π1(Σb×ΣbΔ)\mathsf{P}_2(\Sigma_b)=\pi_1(\Sigma_b \times \Sigma_b - \Delta) be the corresponding pure braid group on two strands. A finite quotient φ ⁣:P2(Σb)G\varphi \colon \mathsf{P}_2(\Sigma_b) \to G is called "admissible" if φ\varphi does not factor through π1(Σb×Σb)\pi_1(\Sigma_b \times \Sigma_b). In this work we classify all admissible quotients of P2(Σb)\mathsf{P}_2(\Sigma_b) such that G127|G| \leq 127.

Keywords

Cite

@article{arxiv.2512.18817,
  title  = {On finite quotients of surface braid groups having order at most $127$},
  author = {Francesco Polizzi and Pietro Sabatino},
  journal= {arXiv preprint arXiv:2512.18817},
  year   = {2026}
}

Comments

Significantly shorter version. 13 pages, 2 figures