@INPROCEEDINGS { Rsds3515,
author = {Shimbo, Masaru and Murai, Tetsuya}, 
title = {Vagueness and Rough Set Theory, Revisited}, 
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 = {97--104}, 
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 = {A view on vagueness is presented based on crisp and fuzzy set formation in possible-worlds restriction models for rough set theory, the models witch are a kind of Scott-Montague models for modal logic. Emphasis is put on the point that vagueness has inconsistency that cannot be removed.}, 
keywords = {vagueness, rough sets, equivalence relations, proximity relations, fuzzy sets, maximal consistency, inconsistency, }, 
}