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  2. Cycle (graph theory) - Wikipedia

    en.wikipedia.org/wiki/Cycle_(graph_theory)

    Strangulated graph, a graph in which every peripheral cycle is a triangle; Strongly connected graph, a directed graph in which every edge is part of a cycle; Triangle-free graph, a graph without three-vertex cycles; Even-cycle-free graph, a graph without even cycles; Even-hole-free graph, a graph without even cycles of length larger or equal to 6

  3. Cycle graph - Wikipedia

    en.wikipedia.org/wiki/Cycle_graph

    A directed cycle graph of length 8. A directed cycle graph is a directed version of a cycle graph, with all the edges being oriented in the same direction. In a directed graph, a set of edges which contains at least one edge (or arc) from each directed cycle is called a feedback arc set.

  4. Cycle basis - Wikipedia

    en.wikipedia.org/wiki/Cycle_basis

    In graph theory, a branch of mathematics, a cycle basis of an undirected graph is a set of simple cycles that forms a basis of the cycle space of the graph. That is, it is a minimal set of cycles that allows every even-degree subgraph to be expressed as a symmetric difference of basis cycles. A fundamental cycle basis may be formed from any ...

  5. Circuit rank - Wikipedia

    en.wikipedia.org/wiki/Circuit_rank

    The circuit rank controls the number of ears in an ear decomposition of a graph, a partition of the edges of the graph into paths and cycles that is useful in many graph algorithms. In particular, a graph is 2-vertex-connected if and only if it has an open ear decomposition. This is a sequence of subgraphs, where the first subgraph is a simple ...

  6. Cycle graph (algebra) - Wikipedia

    en.wikipedia.org/wiki/Cycle_graph_(algebra)

    The cycle graph of a group is not uniquely determined up to graph isomorphism; nor does it uniquely determine the group up to group isomorphism. That is, the graph obtained depends on the set of generators chosen, and two different groups (with chosen sets of generators) can generate the same cycle graph. [2]

  7. Mycielskian - Wikipedia

    en.wikipedia.org/wiki/Mycielskian

    The first few graphs in this sequence are the graph M 2 = K 2 with two vertices connected by an edge, the cycle graph M 3 = C 5, and the Grötzsch graph M 4 with 11 vertices and 20 edges. In general, the graph M i is triangle-free, (i−1)-vertex-connected, and i-chromatic.

  8. Cyclic graph - Wikipedia

    en.wikipedia.org/wiki/Cyclic_graph

    In mathematics, a cyclic graph may mean a graph that contains a cycle, or a graph that is a cycle, with varying definitions of cycles. See: Cycle (graph theory), a cycle in a graph; Forest (graph theory), an undirected graph with no cycles; Biconnected graph, an undirected graph in which every edge belongs to a cycle

  9. Triangle-free graph - Wikipedia

    en.wikipedia.org/wiki/Triangle-free_graph

    In the mathematical area of graph theory, a triangle-free graph is an undirected graph in which no three vertices form a triangle of edges. Triangle-free graphs may be equivalently defined as graphs with clique number ≤ 2, graphs with girth ≥ 4, graphs with no induced 3-cycle, or locally independent graphs.

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