Journal
SCIENCE CHINA-INFORMATION SCIENCES
Volume 53, Issue 7, Pages 1397-1408Publisher
SCIENCE PRESS
DOI: 10.1007/s11432-010-3092-z
Keywords
granular computing; formal concept analysis; concept lattice; mathematical model
Funding
- National Natural Science Foundation of China [60673096, 60703117]
- Education Department in Shaanxi Province [08JK089]
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Extent-intent and intent-extent operators are introduced between two complete lattices in this paper and a mathematical model for concept granular computing system is established. We proved that the set of all concepts in this system is a lattice with the greatest element and the least element. This framework includes formal concept lattices from formal contexts, L fuzzy concept lattices from L fuzzy formal contexts and three kinds of variable threshold concept lattices, i.e. the extension and the intension of a concept are a crisp set and a crisp set, a crisp set and a fuzzy set, a fuzzy set and a crisp set, respectively. Finally, some iterative algorithms for constructing concepts are proposed and they are proved to be optimal concepts under some conditions in this system.
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