@INPROCEEDINGS { Rsds3514,
author = {Pagliani, Piero}, 
title = {A Modal Relation Algebra for Generalized Approximation Spaces}, 
booktitle = {Proceedings of the Fourth International Workshop on Rough Sets, Fuzzy Sets, and Machine Discovery}, 
conference = {International Workshop on Rough Sets, Fuzzy Sets, and Machine Discovery}, 
pages = {89--96}, 
publisher = {Japanese Research Group on Rough Sets}, 
address = {Tokyo, Japan}, 
month = {November}, 
year = 1996, 
editor = {Tsumoto, Shusaku and Kobayashi, Satoshi and Yokomori, Takashi and Tanaka, Hiroshi and Nakamura, Akira}, 
isbn = {4-947717-01-7}, 
abstract = {The theory of Approximation Spaces induced by Information Systems over a universe may be generalized assuming that the elements of the universe are connected by means of a binary relation. This paper presents an analysis of this generalization based on an extended interpretation of Modal Logics exploiting the features provided by Relation Algebras. In this way we can easily obtain the usual Approximation Spaces as particular cases and provide a theoretical basis for computer implementations based on matrix manipulation.}, 
keywords = {algebra, approximation spaces, modal logic, relation algebra, rough sets, }, 
}