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Lower central series, surface braid groups, surjections and permutations

Published online by Cambridge University Press:  05 April 2021

PAOLO BELLINGERI
Affiliation:
Normandie Univ., UNICAEN, CNRS, Laboratoire de Mathématiques Nicolas Oresme UMR CNRS 6139, 14000 Caen, France. e-mail: paolo.bellingeri@unicaen.fr
DACIBERG LIMA GONÇALVES
Affiliation:
Departamento de Matemática - IME-USP, Rua do Matão 1010 CEP: 05508-090 - São Paulo - SP - Brazil. e-mail: dlgoncal@ime.usp.br
JOHN GUASCHI
Affiliation:
Normandie Univ., UNICAEN, CNRS, Laboratoire de Mathématiques Nicolas Oresme UMR CNRS 6139, 14000 Caen, France. e-mail: john.guaschi@unicaen.fr

Abstract

Generalising previous results on classical braid groups by Artin and Lin, we determine the values of m, n$\mathbb N$ for which there exists a surjection between the n- and m-string braid groups of an orientable surface without boundary. This result is essentially based on specific properties of their lower central series, and the proof is completely combinatorial. We provide similar but partial results in the case of orientable surfaces with boundary components and of non-orientable surfaces without boundary. We give also several results about the classification of different representations of surface braid groups in symmetric groups.

Type
Research Article
Copyright
© The Author(s), 2021. Published by Cambridge University Press on behalf of Cambridge Philosophical Society

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