Seven Bridges of Königsberg
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The Seven Bridges of Königsberg is a historical puzzle asking for a walking tour through the bridges of the city of Königsberg where each of the city's bridges is crossed exactly once. Its mathematica
In this picture of the Königsberg Cathedral, the bridge on the right is one of the two surviving bridges from Euler's time.
Leonhard Euler
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Leonhard Euler was a Swiss polymath who was active as a mathematician, physicist, astronomer, logician, geographer, music theorist and engineer. He founded the studies of graph theory and topology and
Seven Bridges of Königsberg
…of Königsberg (now Kaliningrad) where each of the city's bridges is crossed exactly once. Its mathematical formalization and proof of impossibility by Leonhard Euler, in 1736, laid the foundations of graph theory and foreshadowed the idea of topology. The city of Königsberg in Prussia (now Kaliningrad, Russia) was…
1753 portrait
1957 Soviet Union stamp commemorating the 250th birthday of Euler. The text says: 250 years from the birth of the great mathematician, academician Leonhard Euler.
Euler's grave at the Alexander Nevsky Monastery
Euler portrait on the sixth series of the 10 Franc banknote