Figure 3
Discipline evolution.
(a) The collaboration network of discipline D1 is split into two disciplines D2 and D3. The modularity increases from Q = 0 to Q = 0.4. The dashed line indicates the partition of the network suggested by the community detection algorithm. Some nodes in the new discipline D3 have also published papers with scholars in D2 and therefore belong to both disciplines. (b) Two collaboration networks of disciplines D4 and D5 are merged into new discipline D6. For scholars in both original disciplines, we pick one based on the number of papers published in each discipline. The dashed line shows the resulting partition, with very low modularity Q = −0.1. The merged community D6 has still low, but higher mudularity Q = 0.
