Signed Graph
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Signed Graph

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High Quality Content by WIKIPEDIA articles! In the area of graph theory in mathematics, a signed graph is a graph in which each edge has a positive or negative sign. Formally, a signed graph is a pair (G, ) that consists of a graph G = (V, E) and a sign mapping or signature from E to the sign group {+, }. The graph may have loops and multiple edges as well as half-edges (with only one endpoint) and loose edges (with no endpoints). Half and loose edges do not receive signs. (In the terminology of the article on graphs, it is a multigraph, but we say graph because in signed graph theory it is us...