Araújo, João2015-03-202015-03-202002Aráujo, João - On idempotent generated semigroups. "Semigroup Forum" [Em linha]. ISSN 0037-1912 (Print) 1432-2137 (Online). Vol. 65, nº 1 (June 2002), p. 1-30037-19121432-2137http://hdl.handle.net/10400.2/3786We provide short and direct proofs for some classical theorems proved by Howie, Levi and McFadden concerning idempotent generated semigroups of transformations on a finite set. Mathematics subject classification: 20M20.engjournal article