Figure 5
A chain graph with vertex connectivity 2V1 (red vertices and black edges) to which 1V1 vertices (green vertices and edges) have been added, forming a chain graph with vertex connectivity 1V13V1. The red circle indicates a vertex that has been changed from degree 2 to 3 by the connection with a 1-connected vertex. Dashed black lines show the repeat unit of the chain graph. |