14 research outputs found

    The Poset of Closures AS A Model of Changing Databases

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    On the Distance of Databases

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    A characterization of hypergraphs which are products of a finite number of edges In memory of Giuseppe Tallini

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    finito di spigoli se e soltanto se è intervallo-regolare, ha ogni spigolo “gated ” ed ha almeno un vertice di grado finito. In particolare, ciò dà luogo ad una caratterizzazione dei grafi di Hamming e degli ipercubi. Abstract: We prove that a hypergraph is a product of a finite number of edges if and only if it is interval-regular, satisfies the gated-edge property and has a vertex of finite degree. As a consequence, we get a characterization of Hamming graphs.

    On the number of closure operations

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    The poset of closures as a model of changing databases

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