Maximum common edge subgraph
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Given two graphs and , the maximum common edge subgraph problem is the problem of finding a graph with as many edges as possible which is isomorphic to both a subgraph of and a subgraph of .
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The maximum common edge subgraph problem on general graphs is NP-complete as it is a generalization of subgraph isomorphism: a graph is isomorphic to a subgraph of another graph if and only if the maximum common edge subgraph of and has the same number of edges as . Unless the two inputs and to the maximum common edge subgraph problem are required to have the same number of vertices, the problem is APX-hard.[1]