Abstract: The paper exploits the fact that every information system generates a family of equivalence relations in the set of considered objects, and the corresponding family of partitions of this set, and that this family is a lattice with certain properties. It describes the internal structure of any lattice with such properties and shows that such a lattice is generated by an information system. 

Keywords: Object, attribute, information system, information lattice, coarsening, diamond, region.

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