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- In the mathematical field of graph theory, the intersection number of a graph is the smallest number of elements in a representation of as an intersection graph of finite sets. In such a representation, each vertex is represented as a set, and two vertices are connected by an edge whenever their sets have a common element. Equivalently, the intersection number is the smallest number of cliques needed to cover all of the edges of . A set of cliques that cover all edges of a graph is called a clique edge cover or edge clique cover, or even just a clique cover, although the last term is ambiguous: a clique cover can also be a set of cliques that cover all vertices of a graph. Sometimes "covering" is used in place of "cover". As well as being called the intersection number, the minimum number of these cliques has been called the R-content, edge clique cover number, or clique cover number. The problem of computing the intersection number has been called the intersection number problem, the intersection graph basis problem, covering by cliques, the edge clique cover problem, and the keyword conflict problem. Every graph with vertices and edges has intersection number at most . The intersection number is NP-hard to compute or approximate, but fixed-parameter tractable. (en)
- Число пересечений графа — наименьшее число элементов в представлении данного графа как графа пересечений конечных множеств, или, эквивалентно, наименьшее число клик, необходимых для покрытия всех рёбер графа. (ru)
- Число перетинів графа — найменше число елементів у поданні даного графа як графа перетинів скінченних множин, або, еквівалентно, найменше число клік, необхідних для покриття всіх ребер графа. (uk)
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| rdfs:comment
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- Число пересечений графа — наименьшее число элементов в представлении данного графа как графа пересечений конечных множеств, или, эквивалентно, наименьшее число клик, необходимых для покрытия всех рёбер графа. (ru)
- Число перетинів графа — найменше число елементів у поданні даного графа як графа перетинів скінченних множин, або, еквівалентно, найменше число клік, необхідних для покриття всіх ребер графа. (uk)
- In the mathematical field of graph theory, the intersection number of a graph is the smallest number of elements in a representation of as an intersection graph of finite sets. In such a representation, each vertex is represented as a set, and two vertices are connected by an edge whenever their sets have a common element. Equivalently, the intersection number is the smallest number of cliques needed to cover all of the edges of . (en)
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