%0 Journal Article %T Constructions over localizations of rings %A Alessandro Logar %J Le Matematiche %D 1987 %I University of Catania %X In this paper we construct a category of effective noetherian rings in which linear equations can be ¡°solved¡±. This category is closed with respect to some important constructions like trascendental extensions, quotientations, finite products and localizations with respect to a large class of multiplicatively closed systems. Hence it gives a definition of ¡°constructive¡± rings. %U http://www.dmi.unict.it/ojs/index.php/lematematiche/article/view/728