The main goal of this paper, divided into two sections, is to prove a theorem introduced in 1922 by the polish mathematician Kazimierz Kuratowski. This goal shall be accomplished in the second section of the paper with an argumentation, whose algebraic background has been prior exposed in the first section. The Kuratowski Closure-Complement Theorem asserts … Lire la suite de The Kuratowski Closure-Complement Problem