Figure 3 | Scientific Reports

Figure 3

From: The evolution of interdisciplinarity in physics research

Figure 3

The time evolution of network density and newly appearing links.

Evolution of the link density ρ within the sets of nodes that are hierarchically (a) dissimilar and (b) similar up to second level. Time dependence of the fraction of new links that connect nodes that are hierarchically (c) dissimilar and (d) similar up to the second PACS level. The solid curves indicate linear increase in (a), (b) and (c) with slope 6.2×10−4, 2.2×10−3 and 3.9×10−3, respectively and linear decrease in (d) with slope 1.1×10−3.

Back to article page