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A minimal axiom group for rough set based on quasi-ordering

โœ Scribed by Jian-hua Dai; Wei-dong Chen; Yun-he Pan


Book ID
111840011
Publisher
SP Zhejiang University Press
Year
2004
Tongue
English
Weight
371 KB
Volume
5
Category
Article
ISSN
1009-3095

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It is shown that for any directed quasi-ordered set (Q, ~<), there is a minimal ordinal number h such that every cofinal subset of Q contains a cofinal subset which is the 0-th class original set of a pure h-th class chain of Q. A special case of our results gives necessary and sufficient conditions