2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/154534If F is a finitely generated free group and ϕis an automorphism of F then F \rtimes_ϕZ satisfties a quadratic isoperimetric inequality.188 pages, many figures. This is a monograph in three parts. The three parts have been circulated for a number of years separately (and are arXiv:math/0211459, arXiv:math/0507589 and arXiv:math/0610332). Memoirs of the AMS, to appearGroup Theory20F65 (Primary); 20F06, 20E36, 57M07 (Secondary)text