Bounding the gap between a free group (outer) automorphism and its inverse

• Autores: Marcelino Ladra González, P. V. Silva, Emanuele Ventura
• Localización: Collectanea mathematica, ISSN 0010-0757, Vol. 67, Fasc. 3, 2016, págs. 329-346
• Idioma: inglés
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• Resumen

  • For any finitely generated group ? , two complexity functions ?? and ?? are defined to measure the maximal possible gap between the norm of an automorphism (respectively, outer automorphism) of ? and the norm of its inverse. Restricting attention to free groups ?? , the exact asymptotic behaviour of ?2 and ?2 is computed. For rank ?⩾3 , polynomial lower bounds are provided for ?? and ?? , and the existence of a polynomial upper bound is proved for ?? .