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The graph difference of graphs and is the graph with adjacency matrix given by the difference of adjacency matrices of and . A graph difference is defined when the orders of and are the same, and can be computed in the Wolfram Language using GraphDifference[g, h].
Skiena, S. "Sum and Difference." §4.1.2 in Implementing Discrete Mathematics: Combinatorics and Graph Theory with Mathematica. Reading, MA: Addison-Wesley, p. 131, 1990.
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