📅 26 August 1735
Euler showed that the requested walk was impossible by reducing the city to land regions and connecting bridges.
📅 26 August 1735
Ignoring distances and shapes allowed Euler to focus on connections, a foundational move toward graph theory and topology.
📅 26 August 1735
The four land areas each had an odd number of incident bridges, preventing a trail that used each bridge exactly once.
📅 26 August 1735
Euler's publication is a conventional origin point, while continuous-line traditions in Africa and Oceania show other culturally embedded studies of paths and networks.
