Concept

Convex bipartite graph

Summary
In the mathematical field of graph theory, a convex bipartite graph is a bipartite graph with specific properties. A bipartite graph, (U ∪ V, E), is said to be convex over the vertex set U if U can be enumerated such that for all v ∈ V the vertices adjacent to v are consecutive. Convexity over V is defined analogously. A bipartite graph (U ∪ V, E) that is convex over both U and V is said to be biconvex or doubly convex. Formal definition Let G = (U ∪ V, E) be a bipartite graph, i.e., the vertex set is U ∪ V where U ∩ V = ∅. Let NG(v) denote the neighborhood of a vertex v ∈ V. The graph G is convex over U if and only if there exists a bijective mapping, f: U → {1, …, |U|}, such that for all v ∈ V, for any two vertices x,y ∈ NG(v) ⊆ U there does not exist a z ∉ NG(v) such that f(x) 
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