Atribución-NoComercial 4.0 InternacionalCelani, Sergio Arturo2019-06-282019-06-281997https://repositorio.unal.edu.co/handle/unal/43676In this note we shall generalize some results of the threevalued Lukasiewicz algebras to three-valued symmetrical Heyting algebras. We prove that a three-valued Heyting algebra with axe is a product of a Boolean algebra by a three-valued symmetrical Heyting symmetric algebra with center. We also introduce the involutive rough sets and we prove a representation theorem for three-valued symmetrical Heyting algebras by means of rough sets.application/pdfspaDerechos reservados - Universidad Nacional de Colombiahttp://creativecommons.org/licenses/by-nc/4.0/Artículo de revistahttp://bdigital.unal.edu.co/33774/info:eu-repo/semantics/openAccessHeyting algebrasDe Morgan algebrasrough sets