17.1 Unary Operations on Graphs17.2 Binary Operations on Subgraphs17.3 Graphs from Subgraphs17.3.1 Graphs from Type 1 Adjacency17.3.2 Graphs from Type 2 Adjacency17.3.3 Graphs from Type 4 Adjacency17.3.4 Graphs from Type 6 Adjacency17.3.5 Subgraphs of the Line Graph17.4 Variations in the Adjacency Definition17.4.1 Union Adjacency17.4.2 Chord Crossing Adjacency17.4.3 Incidence Adjacency17.4.4 Counting based Adjacency17.4.5 Distance based Adjacency17.5 Transformation Graphs17.6 Iteration, Convergence and Completion17.7 Research Problems