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B. Ganter, R. Wille initiated formal concept analysis. Concept lattice is one of the main notions and tools. Some researchers have investigated the fuzzification of the classical crisp concept lattice. One of them was shown by R. Bĕlohlávek : concept lattice in fuzzy setting. The second one was given by S. Kraj i: generalized concept lattice. On the other hand, as a generalization of concept,...
In this paper, two L-rough approximation operators are defined by an arbitrary mapping from the set of all singletons to the set of all L-sets, which is a graded extension of Järvinen's method. It also provides a convenient method to compute rough sets in fuzzy setting. Then the algebraic structure of rough sets and the relation to L-topology are investigated. In the end, three special cases are discussed:...
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