2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/67316Generally, in any human field, a Smarandache Structure on a set A means a weak structure W on A such that there exists a proper subset B contained in A which is embedded with a stronger structure S. These types of structures occurin our everyday'slife, that's why we study them in this book. Thus, as a particular case: A Smarandache groupoid is a groupoid G which has a proper subset S contained in G such that S under the operation of G is a semigroup.114 pages, 133 tables, 12 figures, many definitions and unsolved problemsGeneral Mathematics18Bxx; 20-xx, 20L05,20Mxx, 20Nxxtext