# Links for Chapter 6

Relations, Networks, Flows

links

### Footnote 5

The number of possible shortest paths, i.e., pairs of vertices, choosable from a graph of any given size is given by the numbers in integer sequence A000522.

### Footnote 6

The World City Network basic data set is available at the Globalisation and World Cities Research Network website. These data are used in figures 6.5, 6.6, and 6.13.

### Figure 6.5

See Footnote 6 above.

### Figure 6.6

See Footnote 6 above.

### Footnote 8

Stirling numbers of the 2nd kind are in integer sequence A008277. You can obtain values of these numbers at this web page.

### Figure 6.7

The trade data used in this Figure and in Figure 6.9 are version 3 of the trade data currently available from the Correlates of War website.

### Figure 6.9

See Figure 6.7 above.

### Figure 6.13

See Footnote 6 above.

© 2023 David O’Sullivan