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What is a bipartite graph?

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A bipartite graph also called a bi-graph, is a set of graph vertices, i.e, points where multiple lines meet, decomposed into two disjoint sets, meaning they have no element in common, such that no two graph vertices within the same set are adjacent.

Adjacent nodes are any two nodes that are connected by an edge.

A bipartite graph is a special case of a k-partite graph with k = 2. The illustration below shows some bipartite graphs, with vertices in each graph colored based on the disjoint set they belong to

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Each color is connected to a different color.

Bipartite graphs are equivalent to two-colorable graphs i.e., coloring of the vertices using two colors in such a way that vertices of the same color are never adjacent along an edge. All Acyclic1 graphs are bipartite. A cyclic2 graph is bipartite iff all its cycles are of even length. Some common examples of a bipartite graph include star graphs3, grid graphs4 and gear graphs5.