2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/155991The family tree of a Galton-Watson branching process may contain N-ary subtrees, i.e. subtrees whose vertices have at least N>0 children. For family trees without infinite N-ary subtrees, we study how fast N-ary subtrees of height t disappear as t goes to infinity.9 pages, no figuresProbability60J80; 05C05text