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On the Lattice of Intervals and Rough Sets Rough sets, developed by Pawlak , are an important tool to describe a situation of incomplete or partially unknown information. One of the algebraic models deals with the pair of the upper and the lower approximation. Although usually the tolerance or the equivalence relation is taken into account when considering a rough set, here we rather concentrate on the model with the pair of two definable sets, hence we are close to the notion of an intervaldoi:10.2478/v10037-009-0030-x fatcat:vifxaj53fne6bhrd6o5nlz6oie