Theoretical considerations about subset descriptions

In this paper we present a new theoretical approach about intensional desciptions of subsets extensionally defined. In this approach some subsets of a certain domain are initially defined in an extensional way, in such a way that for each element of the subsets some attributes are known (the attributes are the same for each element). Obtaining an intensional description of the defined subsets consist of finding a property based on the attributes associated with the elements that allows classifying all the elements of the domain in their corresponding subset.