Abstract
A 1-cut of a fuzzy relation (sometimes called a core) does not contain all the information that is represented by the fuzzy relation. Particularly, a fuzzy order ≼ on a universe X equipped with an fuzzy equality ≈ is not uniquely determined by its 1-cut 1≼={〈x,y〉 | (x≼y)=1} . That is, there are in general several fuzzy orders with a common 1-cut. We show that, if the fuzzy order obeys in addition the lattice structure (which many natural examples of fuzzy orders do), it is uniquely determined by its 1-cut. Moreover, we discuss consequences of this result for the so-called fuzzy concept lattices and formal concept analysis.
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