(1995)Páginas 63 - 72
Abstract. A generating mechanism by initial structures recently proposed by C. J. Ruiz  is examined from a general categorical point of view. Then, the subcategory generated by an arbitrary object is studied.Palabras claves. Categories, topological categories, reflective subcategories, concrete categories, functors, faithful functors, initial and final structures, complete lattices, concrete adjoint pairs, category and structure generators.