Figure 3.

The chain, and the network

Hover any node. Watch how far the idea reaches.
Kerala. One lineage. One region. Copied by hand.
Europe. Royal Society, Académie, correspondence — a mesh.
Kerala · a thread Europe · a mesh hover a node
Names drawn from standard scholarship on the Kerala School (Plofker, Divakaran, Joseph) and on early-modern European mathematics (Mokyr, Huff). See the essay sources.