## Abstract

Irreducible Artin groups of finite type can be parametrized via their associated Coxeter diagrams into six sporadic examples and four infinite families, each of which is further parametrized by the natural numbers. Within each of these four infinite families, we investigate the relationship between elementary equivalence and isomorphism. For three out of the four families, we show that two groups in the same family are equivalent if and only if they are isomorphic; a positive, but weaker, result is also attained for the fourth family. In particular, we show that two braid groups are elementarily equivalent if and only if they are isomorphic. The 1 fragment suffices to distinguish the elementary theories of the groups in question. As a consequence of our work, we prove that there are infinitely many elementary equivalence classes of irreducible Artin groups of finite type. We also show that mapping class groups of closed surfaces - a geometric analogue of braid groups - are elementarily equivalent if and only if they are isomorphic.

Original language | English |
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Pages (from-to) | 331-344 |

Number of pages | 14 |

Journal | International Journal of Algebra and Computation |

Volume | 28 |

Issue number | 2 |

DOIs | |

State | Published - 1 Mar 2018 |

Externally published | Yes |

## Keywords

- Artin groups
- Braid groups
- Elementary equivalence
- Mapping class groups

## ASJC Scopus subject areas

- Mathematics (all)