1736

In 1736 Swiss German mathematician and physicist Leonhard Euler, working at the Imperial Russian Academy of Sciences in St. Petersburg, published "Solutio problematis ad geometriam situs pertinentis," *Commentarii Academiae Scientiarum Imperialis Petropolitanae* **8** (1736) 128-40. This negative solution to the Seven Bridges of Königsberg problem represented the beginning of graph theory, topology and network science.

An extended English translation of Euler's paper appeared in Biggs, Lloyd & Wilson, *Graph Theory 1736-1936* (1977) 1-20.

Lima, *Visual Complexity: Mapping Patterns of Information* (2011) 74-75.