Complement graph

The Petersen graph (on the left) and its complement graph (on the right).

In the mathematical field of graph theory, the complement or inverse of a graph G is a graph H on the same vertices such that two distinct vertices of H are adjacent if and only if they are not adjacent in G. That is, to generate the complement of a graph, one fills in all the missing edges required to form a complete graph, and removes all the edges that were previously there.[1]

The complement is not the set complement of the graph; only the edges are complemented.

  1. ^ Bondy, John Adrian; Murty, U. S. R. (1976), Graph Theory with Applications, North-Holland, p. 6, ISBN 0-444-19451-7.

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