The Prussian city of Königsberg, now Kaliningrad in Russia, in the Middle Ages. The 18th-century city map is a digitally enhanced reproduction that was modified to highlight the river and bridges.

Euler concluded that the desired journey can be made if it starts from area D or E. He then went on in his paper to develop simplified rules for determining whether a bridge-crossing problem has a ...

The problem was to find a walk through the city that would cross each bridge once and only once. No one knows who was the first to think about it. Many people tried to find solution during walking.

One of our favourite maths problems is called the bridges of Königsberg. It involves finding a path on an 18th century map of the city of Königsberg that crosses each of its seven bridges once and ...

Of Königsberg’s famous seven bridges, five survived bombing during World War II before the city was taken by Soviet forces. In one of those moves that make international dinner parties awkward ...

This article was originally published with the title “ Leonhard Euler and the Koenigsberg Bridges ” in Scientific American Magazine Vol. 189 No. 1 (July 1953), p. 66 doi:10.1038 ...