Abstract (EN):
For any finitely generated group G, two complexity functions alpha(G) and beta(G) are defined to measure the maximal possible gap between the norm of an automorphism (respectively, outer automorphism) of G and the norm of its inverse. Restricting attention to free groups F-r, the exact asymptotic behaviour of alpha(2) and beta(2) is computed. For rank r >= 3, polynomial lower bounds are provided for alpha(r) and beta(r), and the existence of a polynomial upper bound is proved for beta(r).
Idioma:
Inglês
Tipo (Avaliação Docente):
Científica
Nº de páginas:
18