no. 3
Virtual braids and permutations
[Tresses virtuelles et permutations]
Bellingeri, Paolo1 ; Paris, Luis2
1 LMNO, UMR 6139, CNRS Université de Caen-Normandie 14000 Caen (France)
2 IMB, UMR 5584, CNRS Univ. Bourgogne Franche-Comté 21000 Dijon (France)
Annales de l'Institut Fourier, Tome 70 (2020) no. 3, pp. 1341-1362.

Soient VB n le groupe de tresses virtuelles à n brins et 𝔖 n le groupe symétrique de l’ensemble à n éléments. Soient n,m∈ℕ tels que n≥5, m≥2 et n≥m. Nous déterminons tous les homomorphismes de VB n dans 𝔖 m , de 𝔖 n dans VB m et de VB n dans VB m . Comme corollaires nous obtenons que Out(VB n ) est isomorphe à ℤ/2ℤ×ℤ/2ℤ et que VB n est à la fois hopfien et co-hofpien.

Let VB n be the virtual braid group on n strands and let 𝔖 n be the symmetric group on n letters. Let n,m∈ℕ such that n≥5, m≥2 and n≥m. We determine all possible homomorphisms from VB n to 𝔖 m , from 𝔖 n to VB m and from VB n to VB m . As corollaries we get that Out(VB n ) is isomorphic to ℤ/2ℤ×ℤ/2ℤ and that VB n is both, Hopfian and co-Hofpian.

Reçu le :
Accepté le :
Publié le :
DOI : 10.5802/aif.3336
Classification : 20F36, 20E36
Keywords: virtual braid group, Bass–Serre theory, Artin group, symmetric group, amalgamated product
Mot clés : groupe de tresses virtuelles, théorie de Bass–Serre, groupe d’Artin, groupe symétrique, produit amalgamé

Bellingeri, Paolo 1 ; Paris, Luis 2

1 LMNO, UMR 6139, CNRS Université de Caen-Normandie 14000 Caen (France)
2 IMB, UMR 5584, CNRS Univ. Bourgogne Franche-Comté 21000 Dijon (France)
Licence : CC-BY-ND 4.0
Droits d'auteur : Les auteurs conservent leurs droits 
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     title = {Virtual braids and permutations},
     journal = {Annales de l'Institut Fourier},
     pages = {1341--1362},
     publisher = {Association des Annales de l{\textquoteright}institut Fourier},
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Bellingeri, Paolo; Paris, Luis. Virtual braids and permutations. Annales de l'Institut Fourier, Tome 70 (2020) no. 3, pp. 1341-1362. doi : 10.5802/aif.3336. https://aif.centre-mersenne.org/articles/10.5802/aif.3336/

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