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  2. Intersection number (graph theory) - Wikipedia

    en.wikipedia.org/wiki/Intersection_number_(graph...

    [1] [2] A set of cliques that cover all edges of a graph is called a clique edge cover [3] or edge clique cover, [4] 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. [5] Sometimes "covering" is used in place of "cover". [6]

  3. Covering graph - Wikipedia

    en.wikipedia.org/wiki/Covering_graph

    Hence C is a 2-fold cover or a double cover of H. For any graph G, it is possible to construct the bipartite double cover of G, which is a bipartite graph and a double cover of G. The bipartite double cover of G is the tensor product of graphs G × K 2: If G is already bipartite, its bipartite double cover consists of two disjoint copies of G ...

  4. Glossary of graph theory - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_graph_theory

    1. This is the depth of a node plus 1, although some [12] define it instead to be synonym of depth. A node's level in a rooted tree is the number of nodes in the path from the root to the node. For instance, the root has level 1 and any one of its adjacent nodes has level 2. 2. A set of all node having the same level or depth. [12] line

  5. Covering relation - Wikipedia

    en.wikipedia.org/wiki/Covering_relation

    The Hasse diagram depicting the covering relation of a Tamari lattice is the skeleton of an associahedron. The covering relation of any finite distributive lattice forms a median graph . On the real numbers with the usual total order ≤, the cover set is empty: no number covers another.

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  7. Edge cycle cover - Wikipedia

    en.wikipedia.org/wiki/Edge_cycle_cover

    It has been proven that every bridgeless graph has cycle k-cover for any even integer k≥4. For k=2, it is the well-known cycle double cover conjecture is an open problem in graph theory. The cycle double cover conjecture states that in every bridgeless graph, there exists a set of cycles that together cover every edge of the graph twice. [3]

  8. Zone defense in American football - Wikipedia

    en.wikipedia.org/wiki/Zone_defense_in_American...

    Diagram of the Cover 3 defense. In Cover 3, the two corners and free safety each have responsibility for a deep third of the field, while the strong safety plays like a linebacker. [7] [8] [9] This coverage is generally considered to be a run stopping defense as it focuses on preventing big pass plays and stopping the run while giving up short ...

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