@misc{Mousavi_Amin_Relative,
 author={Mousavi, Amin and Jabedar-Maralani, Parviz},
 howpublished={online},
 publisher={Zielona Góra: Uniwersytet Zielonogórski},
 language={eng},
 abstract={In this paper, by defining a pair of classical sets as a relative set, an extension of the classical set algebra which is a counterpart of Belnap's four-valued logic is achieved. Every relative set partitions all objects into four distinct regions corresponding to four truth-values of Belnap's logic. Like truth-values of Belnap's logic, relative sets have two orderings; one is an order of inclusion and the other is an order of knowledge or information.},
 abstract={By defining a rough set as a pair of definable sets, an integrated approach to relative sets and rough sets is obtained. With this definition, we are able to define an approximation of a rough set in an approximation space, and so we can obtain sequential approximations of a set, which is a good model of communication among agents.},
 type={artykuł},
 title={Relative sets and rough sets},
 keywords={rough sets, set theory, data analysis, multi-valued logic, interval sets, knowledge representation},
}